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Finding the Fourth Proportional to 129,215.80, 193,830.10 and 67,007.80

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Solution

The fourth proportional to 129,215.80, 193,830.10 and 67,007.80 is: 100,515.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,215.80 : 193,830.10 = 67,007.80 : x
  2. Step 2: Convert to fraction form
    129,215.80/193,830.10 = 67,007.80/x
  3. Step 3: Cross multiply
    129,215.80x = 193,830.10 × 67,007.80
  4. Step 4: Simplify right side
    129,215.80x = 12,988,128,574.78
  5. Step 5: Solve for x
    x = 12,988,128,574.78/129,215.80
  6. Step 6: Final answer
    x = 100,515.02

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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.