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Finding the Fourth Proportional to 129,422.64, 193,885.12 and 79,356.72

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Solution

The fourth proportional to 129,422.64, 193,885.12 and 79,356.72 is: 118,882.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,422.64 : 193,885.12 = 79,356.72 : x
  2. Step 2: Convert to fraction form
    129,422.64/193,885.12 = 79,356.72/x
  3. Step 3: Cross multiply
    129,422.64x = 193,885.12 × 79,356.72
  4. Step 4: Simplify right side
    129,422.64x = 15,386,087,180.01
  5. Step 5: Solve for x
    x = 15,386,087,180.01/129,422.64
  6. Step 6: Final answer
    x = 118,882.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.