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Finding the Fourth Proportional to 129,240.84, 178,368.30 and 72,651

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Solution

The fourth proportional to 129,240.84, 178,368.30 and 72,651 is: 100,267.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,240.84 : 178,368.30 = 72,651 : x
  2. Step 2: Convert to fraction form
    129,240.84/178,368.30 = 72,651/x
  3. Step 3: Cross multiply
    129,240.84x = 178,368.30 × 72,651
  4. Step 4: Simplify right side
    129,240.84x = 12,958,635,363.30
  5. Step 5: Solve for x
    x = 12,958,635,363.30/129,240.84
  6. Step 6: Final answer
    x = 100,267.34

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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.