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Finding the Fourth Proportional to 129,389.88, 178,554.06 and 72,797.88

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Solution

The fourth proportional to 129,389.88, 178,554.06 and 72,797.88 is: 100,458.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,389.88 : 178,554.06 = 72,797.88 : x
  2. Step 2: Convert to fraction form
    129,389.88/178,554.06 = 72,797.88/x
  3. Step 3: Cross multiply
    129,389.88x = 178,554.06 × 72,797.88
  4. Step 4: Simplify right side
    129,389.88x = 12,998,357,033.39
  5. Step 5: Solve for x
    x = 12,998,357,033.39/129,389.88
  6. Step 6: Final answer
    x = 100,458.84

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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.