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Finding the Fourth Proportional to 67,186.80, 100,780.20 and 56,689.20

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Solution

The fourth proportional to 67,186.80, 100,780.20 and 56,689.20 is: 85,033.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,186.80 : 100,780.20 = 56,689.20 : x
  2. Step 2: Convert to fraction form
    67,186.80/100,780.20 = 56,689.20/x
  3. Step 3: Cross multiply
    67,186.80x = 100,780.20 × 56,689.20
  4. Step 4: Simplify right side
    67,186.80x = 5,713,148,913.84
  5. Step 5: Solve for x
    x = 5,713,148,913.84/67,186.80
  6. Step 6: Final answer
    x = 85,033.80

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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.