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Finding the Fourth Proportional to 42.09, 62.83 and 39.65

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Solution

The fourth proportional to 42.09, 62.83 and 39.65 is: 59.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.09 : 62.83 = 39.65 : x
  2. Step 2: Convert to fraction form
    42.09/62.83 = 39.65/x
  3. Step 3: Cross multiply
    42.09x = 62.83 × 39.65
  4. Step 4: Simplify right side
    42.09x = 2,490.94
  5. Step 5: Solve for x
    x = 2,490.94/42.09
  6. Step 6: Final answer
    x = 59.19

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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.