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Finding the Fourth Proportional to 712,758.74, 983,565.72 and 390,412.71

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Solution

The fourth proportional to 712,758.74, 983,565.72 and 390,412.71 is: 538,746.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,758.74 : 983,565.72 = 390,412.71 : x
  2. Step 2: Convert to fraction form
    712,758.74/983,565.72 = 390,412.71/x
  3. Step 3: Cross multiply
    712,758.74x = 983,565.72 × 390,412.71
  4. Step 4: Simplify right side
    712,758.74x = 383,996,558,208.30
  5. Step 5: Solve for x
    x = 383,996,558,208.30/712,758.74
  6. Step 6: Final answer
    x = 538,746.90

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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.