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Finding the Fourth Proportional to 42.49, 63.66 and 39.45

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Solution

The fourth proportional to 42.49, 63.66 and 39.45 is: 59.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.49 : 63.66 = 39.45 : x
  2. Step 2: Convert to fraction form
    42.49/63.66 = 39.45/x
  3. Step 3: Cross multiply
    42.49x = 63.66 × 39.45
  4. Step 4: Simplify right side
    42.49x = 2,511.39
  5. Step 5: Solve for x
    x = 2,511.39/42.49
  6. Step 6: Final answer
    x = 59.11

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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.