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Finding the Fourth Proportional to 113.70, 170.64 and 86.58

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Solution

The fourth proportional to 113.70, 170.64 and 86.58 is: 129.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.70 : 170.64 = 86.58 : x
  2. Step 2: Convert to fraction form
    113.70/170.64 = 86.58/x
  3. Step 3: Cross multiply
    113.70x = 170.64 × 86.58
  4. Step 4: Simplify right side
    113.70x = 14,774.01
  5. Step 5: Solve for x
    x = 14,774.01/113.70
  6. Step 6: Final answer
    x = 129.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.