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Finding the Fourth Proportional to 117.64, 176.19 and 87.13

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Solution

The fourth proportional to 117.64, 176.19 and 87.13 is: 130.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.64 : 176.19 = 87.13 : x
  2. Step 2: Convert to fraction form
    117.64/176.19 = 87.13/x
  3. Step 3: Cross multiply
    117.64x = 176.19 × 87.13
  4. Step 4: Simplify right side
    117.64x = 15,351.43
  5. Step 5: Solve for x
    x = 15,351.43/117.64
  6. Step 6: Final answer
    x = 130.50

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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.