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Finding the Fourth Proportional to 113.48, 170.38 and 86.76

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Solution

The fourth proportional to 113.48, 170.38 and 86.76 is: 130.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.48 : 170.38 = 86.76 : x
  2. Step 2: Convert to fraction form
    113.48/170.38 = 86.76/x
  3. Step 3: Cross multiply
    113.48x = 170.38 × 86.76
  4. Step 4: Simplify right side
    113.48x = 14,782.17
  5. Step 5: Solve for x
    x = 14,782.17/113.48
  6. Step 6: Final answer
    x = 130.26

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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.