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Finding the Fourth Proportional to 129,049.60, 178,059.34 and 72,457.24

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Solution

The fourth proportional to 129,049.60, 178,059.34 and 72,457.24 is: 99,974.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,049.60 : 178,059.34 = 72,457.24 : x
  2. Step 2: Convert to fraction form
    129,049.60/178,059.34 = 72,457.24/x
  3. Step 3: Cross multiply
    129,049.60x = 178,059.34 × 72,457.24
  4. Step 4: Simplify right side
    129,049.60x = 12,901,688,332.62
  5. Step 5: Solve for x
    x = 12,901,688,332.62/129,049.60
  6. Step 6: Final answer
    x = 99,974.65

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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.