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Finding the Fourth Proportional to 129,393.68, 178,520.48 and 105,479.20

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Solution

The fourth proportional to 129,393.68, 178,520.48 and 105,479.20 is: 145,526.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,393.68 : 178,520.48 = 105,479.20 : x
  2. Step 2: Convert to fraction form
    129,393.68/178,520.48 = 105,479.20/x
  3. Step 3: Cross multiply
    129,393.68x = 178,520.48 × 105,479.20
  4. Step 4: Simplify right side
    129,393.68x = 18,830,197,414.02
  5. Step 5: Solve for x
    x = 18,830,197,414.02/129,393.68
  6. Step 6: Final answer
    x = 145,526.41

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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.