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Finding the Fourth Proportional to 129,478.92, 178,697.94 and 72,901.32

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Solution

The fourth proportional to 129,478.92, 178,697.94 and 72,901.32 is: 100,613.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,478.92 : 178,697.94 = 72,901.32 : x
  2. Step 2: Convert to fraction form
    129,478.92/178,697.94 = 72,901.32/x
  3. Step 3: Cross multiply
    129,478.92x = 178,697.94 × 72,901.32
  4. Step 4: Simplify right side
    129,478.92x = 13,027,315,707.28
  5. Step 5: Solve for x
    x = 13,027,315,707.28/129,478.92
  6. Step 6: Final answer
    x = 100,613.41

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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.