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Finding the Fourth Proportional to 538.72, 742.72 and 440.32

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Solution

The fourth proportional to 538.72, 742.72 and 440.32 is: 607.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.72 : 742.72 = 440.32 : x
  2. Step 2: Convert to fraction form
    538.72/742.72 = 440.32/x
  3. Step 3: Cross multiply
    538.72x = 742.72 × 440.32
  4. Step 4: Simplify right side
    538.72x = 327,034.47
  5. Step 5: Solve for x
    x = 327,034.47/538.72
  6. Step 6: Final answer
    x = 607.06

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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.