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Finding the Fourth Proportional to 97.74, 147.17 and 86.40

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Solution

The fourth proportional to 97.74, 147.17 and 86.40 is: 130.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.74 : 147.17 = 86.40 : x
  2. Step 2: Convert to fraction form
    97.74/147.17 = 86.40/x
  3. Step 3: Cross multiply
    97.74x = 147.17 × 86.40
  4. Step 4: Simplify right side
    97.74x = 12,715.06
  5. Step 5: Solve for x
    x = 12,715.06/97.74
  6. Step 6: Final answer
    x = 130.09

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.