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Finding the Fourth Proportional to 487.72, 731.45 and 141.00

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Solution

The fourth proportional to 487.72, 731.45 and 141.00 is: 211.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.72 : 731.45 = 141.00 : x
  2. Step 2: Convert to fraction form
    487.72/731.45 = 141.00/x
  3. Step 3: Cross multiply
    487.72x = 731.45 × 141.00
  4. Step 4: Simplify right side
    487.72x = 103,135.55
  5. Step 5: Solve for x
    x = 103,135.55/487.72
  6. Step 6: Final answer
    x = 211.47

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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.