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Finding the Fourth Proportional to 129,461.92, 178,674.48 and 72,884.32

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Solution

The fourth proportional to 129,461.92, 178,674.48 and 72,884.32 is: 100,589.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,461.92 : 178,674.48 = 72,884.32 : x
  2. Step 2: Convert to fraction form
    129,461.92/178,674.48 = 72,884.32/x
  3. Step 3: Cross multiply
    129,461.92x = 178,674.48 × 72,884.32
  4. Step 4: Simplify right side
    129,461.92x = 13,022,567,976.15
  5. Step 5: Solve for x
    x = 13,022,567,976.15/129,461.92
  6. Step 6: Final answer
    x = 100,589.95

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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.