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Finding the Fourth Proportional to 129,472.80, 178,655.94 and 72,873.24

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Solution

The fourth proportional to 129,472.80, 178,655.94 and 72,873.24 is: 100,555.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,472.80 : 178,655.94 = 72,873.24 : x
  2. Step 2: Convert to fraction form
    129,472.80/178,655.94 = 72,873.24/x
  3. Step 3: Cross multiply
    129,472.80x = 178,655.94 × 72,873.24
  4. Step 4: Simplify right side
    129,472.80x = 13,019,237,193.05
  5. Step 5: Solve for x
    x = 13,019,237,193.05/129,472.80
  6. Step 6: Final answer
    x = 100,555.77

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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.