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Finding the Fourth Proportional to 55.20, 82.64 and 42.32

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Solution

The fourth proportional to 55.20, 82.64 and 42.32 is: 63.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.20 : 82.64 = 42.32 : x
  2. Step 2: Convert to fraction form
    55.20/82.64 = 42.32/x
  3. Step 3: Cross multiply
    55.20x = 82.64 × 42.32
  4. Step 4: Simplify right side
    55.20x = 3,497.32
  5. Step 5: Solve for x
    x = 3,497.32/55.20
  6. Step 6: Final answer
    x = 63.36

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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.