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Finding the Fourth Proportional to 129,479.84, 178,685.52 and 72,893.24

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Solution

The fourth proportional to 129,479.84, 178,685.52 and 72,893.24 is: 100,594.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,479.84 : 178,685.52 = 72,893.24 : x
  2. Step 2: Convert to fraction form
    129,479.84/178,685.52 = 72,893.24/x
  3. Step 3: Cross multiply
    129,479.84x = 178,685.52 × 72,893.24
  4. Step 4: Simplify right side
    129,479.84x = 13,024,966,493.88
  5. Step 5: Solve for x
    x = 13,024,966,493.88/129,479.84
  6. Step 6: Final answer
    x = 100,594.55

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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.