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Finding the Fourth Proportional to 487.90, 731.19 and 357.29

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Solution

The fourth proportional to 487.90, 731.19 and 357.29 is: 535.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.90 : 731.19 = 357.29 : x
  2. Step 2: Convert to fraction form
    487.90/731.19 = 357.29/x
  3. Step 3: Cross multiply
    487.90x = 731.19 × 357.29
  4. Step 4: Simplify right side
    487.90x = 261,243.22
  5. Step 5: Solve for x
    x = 261,243.22/487.90
  6. Step 6: Final answer
    x = 535.45

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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.