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Finding the Fourth Proportional to 61.72, 85.38 and 53.32

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Solution

The fourth proportional to 61.72, 85.38 and 53.32 is: 73.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.72 : 85.38 = 53.32 : x
  2. Step 2: Convert to fraction form
    61.72/85.38 = 53.32/x
  3. Step 3: Cross multiply
    61.72x = 85.38 × 53.32
  4. Step 4: Simplify right side
    61.72x = 4,552.46
  5. Step 5: Solve for x
    x = 4,552.46/61.72
  6. Step 6: Final answer
    x = 73.76

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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.