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Finding the Fourth Proportional to 55.76, 83.52 and 42.20

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Solution

The fourth proportional to 55.76, 83.52 and 42.20 is: 63.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.76 : 83.52 = 42.20 : x
  2. Step 2: Convert to fraction form
    55.76/83.52 = 42.20/x
  3. Step 3: Cross multiply
    55.76x = 83.52 × 42.20
  4. Step 4: Simplify right side
    55.76x = 3,524.13
  5. Step 5: Solve for x
    x = 3,524.13/55.76
  6. Step 6: Final answer
    x = 63.21

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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.