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Finding the Fourth Proportional to 1,259.40, 1,888.56 and 393.78

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Solution

The fourth proportional to 1,259.40, 1,888.56 and 393.78 is: 590.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.40 : 1,888.56 = 393.78 : x
  2. Step 2: Convert to fraction form
    1,259.40/1,888.56 = 393.78/x
  3. Step 3: Cross multiply
    1,259.40x = 1,888.56 × 393.78
  4. Step 4: Simplify right side
    1,259.40x = 743,677.16
  5. Step 5: Solve for x
    x = 743,677.16/1,259.40
  6. Step 6: Final answer
    x = 590.50

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.