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Finding the Fourth Proportional to 71.34, 98.36 and 61.49

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Solution

The fourth proportional to 71.34, 98.36 and 61.49 is: 84.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.34 : 98.36 = 61.49 : x
  2. Step 2: Convert to fraction form
    71.34/98.36 = 61.49/x
  3. Step 3: Cross multiply
    71.34x = 98.36 × 61.49
  4. Step 4: Simplify right side
    71.34x = 6,048.39
  5. Step 5: Solve for x
    x = 6,048.39/71.34
  6. Step 6: Final answer
    x = 84.78

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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.