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Finding the Fourth Proportional to 42.69, 58.89 and 39.02

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Solution

The fourth proportional to 42.69, 58.89 and 39.02 is: 53.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.69 : 58.89 = 39.02 : x
  2. Step 2: Convert to fraction form
    42.69/58.89 = 39.02/x
  3. Step 3: Cross multiply
    42.69x = 58.89 × 39.02
  4. Step 4: Simplify right side
    42.69x = 2,297.89
  5. Step 5: Solve for x
    x = 2,297.89/42.69
  6. Step 6: Final answer
    x = 53.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.