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Finding the Fourth Proportional to 113.49, 170.03 and 87.72

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Solution

The fourth proportional to 113.49, 170.03 and 87.72 is: 131.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.49 : 170.03 = 87.72 : x
  2. Step 2: Convert to fraction form
    113.49/170.03 = 87.72/x
  3. Step 3: Cross multiply
    113.49x = 170.03 × 87.72
  4. Step 4: Simplify right side
    113.49x = 14,914.59
  5. Step 5: Solve for x
    x = 14,914.59/113.49
  6. Step 6: Final answer
    x = 131.42

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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.