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Finding the Fourth Proportional to 60.62, 83.64 and 39.90

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Solution

The fourth proportional to 60.62, 83.64 and 39.90 is: 55.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.62 : 83.64 = 39.90 : x
  2. Step 2: Convert to fraction form
    60.62/83.64 = 39.90/x
  3. Step 3: Cross multiply
    60.62x = 83.64 × 39.90
  4. Step 4: Simplify right side
    60.62x = 3,337.24
  5. Step 5: Solve for x
    x = 3,337.24/60.62
  6. Step 6: Final answer
    x = 55.05

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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.