Home / 129,128.16-193,275.60-66,712.80

Finding the Fourth Proportional to 129,128.16, 193,275.60 and 66,712.80

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Solution

The fourth proportional to 129,128.16, 193,275.60 and 66,712.80 is: 99,853.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,128.16 : 193,275.60 = 66,712.80 : x
  2. Step 2: Convert to fraction form
    129,128.16/193,275.60 = 66,712.80/x
  3. Step 3: Cross multiply
    129,128.16x = 193,275.60 × 66,712.80
  4. Step 4: Simplify right side
    129,128.16x = 12,893,956,447.68
  5. Step 5: Solve for x
    x = 12,893,956,447.68/129,128.16
  6. Step 6: Final answer
    x = 99,853.95

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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.