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Finding the Fourth Proportional to 83.60, 115.18 and 70.49

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Solution

The fourth proportional to 83.60, 115.18 and 70.49 is: 97.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.60 : 115.18 = 70.49 : x
  2. Step 2: Convert to fraction form
    83.60/115.18 = 70.49/x
  3. Step 3: Cross multiply
    83.60x = 115.18 × 70.49
  4. Step 4: Simplify right side
    83.60x = 8,118.29
  5. Step 5: Solve for x
    x = 8,118.29/83.60
  6. Step 6: Final answer
    x = 97.11

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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.