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Finding the Fourth Proportional to 42.74, 59.01 and 39.79

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Solution

The fourth proportional to 42.74, 59.01 and 39.79 is: 54.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.74 : 59.01 = 39.79 : x
  2. Step 2: Convert to fraction form
    42.74/59.01 = 39.79/x
  3. Step 3: Cross multiply
    42.74x = 59.01 × 39.79
  4. Step 4: Simplify right side
    42.74x = 2,347.71
  5. Step 5: Solve for x
    x = 2,347.71/42.74
  6. Step 6: Final answer
    x = 54.94

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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.