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Finding the Fourth Proportional to 60.72, 91.20 and 39.36

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Solution

The fourth proportional to 60.72, 91.20 and 39.36 is: 59.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.72 : 91.20 = 39.36 : x
  2. Step 2: Convert to fraction form
    60.72/91.20 = 39.36/x
  3. Step 3: Cross multiply
    60.72x = 91.20 × 39.36
  4. Step 4: Simplify right side
    60.72x = 3,589.63
  5. Step 5: Solve for x
    x = 3,589.63/60.72
  6. Step 6: Final answer
    x = 59.12

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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.