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Finding the Fourth Proportional to 129,456.48, 178,705 and 87,039.60

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Solution

The fourth proportional to 129,456.48, 178,705 and 87,039.60 is: 120,151.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,456.48 : 178,705 = 87,039.60 : x
  2. Step 2: Convert to fraction form
    129,456.48/178,705 = 87,039.60/x
  3. Step 3: Cross multiply
    129,456.48x = 178,705 × 87,039.60
  4. Step 4: Simplify right side
    129,456.48x = 15,554,411,718.00
  5. Step 5: Solve for x
    x = 15,554,411,718.00/129,456.48
  6. Step 6: Final answer
    x = 120,151.67

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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.