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Finding the Fourth Proportional to 61.47, 84.78 and 59.49

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Solution

The fourth proportional to 61.47, 84.78 and 59.49 is: 82.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.47 : 84.78 = 59.49 : x
  2. Step 2: Convert to fraction form
    61.47/84.78 = 59.49/x
  3. Step 3: Cross multiply
    61.47x = 84.78 × 59.49
  4. Step 4: Simplify right side
    61.47x = 5,043.56
  5. Step 5: Solve for x
    x = 5,043.56/61.47
  6. Step 6: Final answer
    x = 82.05

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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.