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Finding the Fourth Proportional to 129,508.34, 178,734.30 and 75,790.15

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Solution

The fourth proportional to 129,508.34, 178,734.30 and 75,790.15 is: 104,597.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,508.34 : 178,734.30 = 75,790.15 : x
  2. Step 2: Convert to fraction form
    129,508.34/178,734.30 = 75,790.15/x
  3. Step 3: Cross multiply
    129,508.34x = 178,734.30 × 75,790.15
  4. Step 4: Simplify right side
    129,508.34x = 13,546,298,960.31
  5. Step 5: Solve for x
    x = 13,546,298,960.31/129,508.34
  6. Step 6: Final answer
    x = 104,597.89

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1.5x scale

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.