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Finding the Fourth Proportional to 59, 81.41 and 42.70

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Solution

The fourth proportional to 59, 81.41 and 42.70 is: 58.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    59 : 81.41 = 42.70 : x
  2. Step 2: Convert to fraction form
    59/81.41 = 42.70/x
  3. Step 3: Cross multiply
    59x = 81.41 × 42.70
  4. Step 4: Simplify right side
    59x = 3,476.21
  5. Step 5: Solve for x
    x = 3,476.21/59
  6. Step 6: Final answer
    x = 58.92

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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.