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Finding the Fourth Proportional to 60.99, 91.38 and 39.57

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Solution

The fourth proportional to 60.99, 91.38 and 39.57 is: 59.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.99 : 91.38 = 39.57 : x
  2. Step 2: Convert to fraction form
    60.99/91.38 = 39.57/x
  3. Step 3: Cross multiply
    60.99x = 91.38 × 39.57
  4. Step 4: Simplify right side
    60.99x = 3,615.91
  5. Step 5: Solve for x
    x = 3,615.91/60.99
  6. Step 6: Final answer
    x = 59.29

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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.