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Finding the Fourth Proportional to 91.72, 137.47 and 39.70

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Solution

The fourth proportional to 91.72, 137.47 and 39.70 is: 59.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.72 : 137.47 = 39.70 : x
  2. Step 2: Convert to fraction form
    91.72/137.47 = 39.70/x
  3. Step 3: Cross multiply
    91.72x = 137.47 × 39.70
  4. Step 4: Simplify right side
    91.72x = 5,457.17
  5. Step 5: Solve for x
    x = 5,457.17/91.72
  6. Step 6: Final answer
    x = 59.50

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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.