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Finding the Fourth Proportional to 60.66, 90.42 and 55.80

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Solution

The fourth proportional to 60.66, 90.42 and 55.80 is: 83.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.66 : 90.42 = 55.80 : x
  2. Step 2: Convert to fraction form
    60.66/90.42 = 55.80/x
  3. Step 3: Cross multiply
    60.66x = 90.42 × 55.80
  4. Step 4: Simplify right side
    60.66x = 5,045.44
  5. Step 5: Solve for x
    x = 5,045.44/60.66
  6. Step 6: Final answer
    x = 83.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.