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Finding the Fourth Proportional to 61.72, 85.16 and 42.32

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Solution

The fourth proportional to 61.72, 85.16 and 42.32 is: 58.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.72 : 85.16 = 42.32 : x
  2. Step 2: Convert to fraction form
    61.72/85.16 = 42.32/x
  3. Step 3: Cross multiply
    61.72x = 85.16 × 42.32
  4. Step 4: Simplify right side
    61.72x = 3,603.97
  5. Step 5: Solve for x
    x = 3,603.97/61.72
  6. Step 6: Final answer
    x = 58.39

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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.