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Finding the Fourth Proportional to 129,471.88, 178,674.50 and 72,885.24

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Solution

The fourth proportional to 129,471.88, 178,674.50 and 72,885.24 is: 100,583.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,471.88 : 178,674.50 = 72,885.24 : x
  2. Step 2: Convert to fraction form
    129,471.88/178,674.50 = 72,885.24/x
  3. Step 3: Cross multiply
    129,471.88x = 178,674.50 × 72,885.24
  4. Step 4: Simplify right side
    129,471.88x = 13,022,733,814.38
  5. Step 5: Solve for x
    x = 13,022,733,814.38/129,471.88
  6. Step 6: Final answer
    x = 100,583.49

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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.