Home / 712,309.35-982,986.78-390,019.39

Finding the Fourth Proportional to 712,309.35, 982,986.78 and 390,019.39

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Solution

The fourth proportional to 712,309.35, 982,986.78 and 390,019.39 is: 538,226.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,309.35 : 982,986.78 = 390,019.39 : x
  2. Step 2: Convert to fraction form
    712,309.35/982,986.78 = 390,019.39/x
  3. Step 3: Cross multiply
    712,309.35x = 982,986.78 × 390,019.39
  4. Step 4: Simplify right side
    712,309.35x = 383,383,904,313.66
  5. Step 5: Solve for x
    x = 383,383,904,313.66/712,309.35
  6. Step 6: Final answer
    x = 538,226.69

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.