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Finding the Fourth Proportional to 129,488.76, 178,722 and 87,022.67

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Solution

The fourth proportional to 129,488.76, 178,722 and 87,022.67 is: 120,109.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,488.76 : 178,722 = 87,022.67 : x
  2. Step 2: Convert to fraction form
    129,488.76/178,722 = 87,022.67/x
  3. Step 3: Cross multiply
    129,488.76x = 178,722 × 87,022.67
  4. Step 4: Simplify right side
    129,488.76x = 15,552,864,734.13
  5. Step 5: Solve for x
    x = 15,552,864,734.13/129,488.76
  6. Step 6: Final answer
    x = 120,109.77

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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.