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Finding the Fourth Proportional to 82,891.80, 124,337.70 and 76,986.90

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Solution

The fourth proportional to 82,891.80, 124,337.70 and 76,986.90 is: 115,480.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,891.80 : 124,337.70 = 76,986.90 : x
  2. Step 2: Convert to fraction form
    82,891.80/124,337.70 = 76,986.90/x
  3. Step 3: Cross multiply
    82,891.80x = 124,337.70 × 76,986.90
  4. Step 4: Simplify right side
    82,891.80x = 9,572,374,076.13
  5. Step 5: Solve for x
    x = 9,572,374,076.13/82,891.80
  6. Step 6: Final answer
    x = 115,480.35

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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.