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Finding the Fourth Proportional to 61.72, 92.58 and 38.90

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Solution

The fourth proportional to 61.72, 92.58 and 38.90 is: 58.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.72 : 92.58 = 38.90 : x
  2. Step 2: Convert to fraction form
    61.72/92.58 = 38.90/x
  3. Step 3: Cross multiply
    61.72x = 92.58 × 38.90
  4. Step 4: Simplify right side
    61.72x = 3,601.45
  5. Step 5: Solve for x
    x = 3,601.45/61.72
  6. Step 6: Final answer
    x = 58.35

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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.