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Finding the Fourth Proportional to 42.63, 63.59 and 39.59

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Solution

The fourth proportional to 42.63, 63.59 and 39.59 is: 59.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.63 : 63.59 = 39.59 : x
  2. Step 2: Convert to fraction form
    42.63/63.59 = 39.59/x
  3. Step 3: Cross multiply
    42.63x = 63.59 × 39.59
  4. Step 4: Simplify right side
    42.63x = 2,517.25
  5. Step 5: Solve for x
    x = 2,517.25/42.63
  6. Step 6: Final answer
    x = 59.05

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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.