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Finding the Fourth Proportional to 487.56, 731.22 and 145.56

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Solution

The fourth proportional to 487.56, 731.22 and 145.56 is: 218.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.56 : 731.22 = 145.56 : x
  2. Step 2: Convert to fraction form
    487.56/731.22 = 145.56/x
  3. Step 3: Cross multiply
    487.56x = 731.22 × 145.56
  4. Step 4: Simplify right side
    487.56x = 106,436.38
  5. Step 5: Solve for x
    x = 106,436.38/487.56
  6. Step 6: Final answer
    x = 218.30

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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.