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Finding the Fourth Proportional to 129,495.76, 178,731.66 and 87,029.67

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Solution

The fourth proportional to 129,495.76, 178,731.66 and 87,029.67 is: 120,119.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,495.76 : 178,731.66 = 87,029.67 : x
  2. Step 2: Convert to fraction form
    129,495.76/178,731.66 = 87,029.67/x
  3. Step 3: Cross multiply
    129,495.76x = 178,731.66 × 87,029.67
  4. Step 4: Simplify right side
    129,495.76x = 15,554,957,388.35
  5. Step 5: Solve for x
    x = 15,554,957,388.35/129,495.76
  6. Step 6: Final answer
    x = 120,119.43

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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.