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Finding the Fourth Proportional to 128,187.18, 176,748.26 and 87,375.47

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Solution

The fourth proportional to 128,187.18, 176,748.26 and 87,375.47 is: 120,475.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,187.18 : 176,748.26 = 87,375.47 : x
  2. Step 2: Convert to fraction form
    128,187.18/176,748.26 = 87,375.47/x
  3. Step 3: Cross multiply
    128,187.18x = 176,748.26 × 87,375.47
  4. Step 4: Simplify right side
    128,187.18x = 15,443,462,289.18
  5. Step 5: Solve for x
    x = 15,443,462,289.18/128,187.18
  6. Step 6: Final answer
    x = 120,475.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.