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Finding the Fourth Proportional to 83,215.80, 124,920.90 and 47,705.40

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Solution

The fourth proportional to 83,215.80, 124,920.90 and 47,705.40 is: 71,613.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,215.80 : 124,920.90 = 47,705.40 : x
  2. Step 2: Convert to fraction form
    83,215.80/124,920.90 = 47,705.40/x
  3. Step 3: Cross multiply
    83,215.80x = 124,920.90 × 47,705.40
  4. Step 4: Simplify right side
    83,215.80x = 5,959,401,502.86
  5. Step 5: Solve for x
    x = 5,959,401,502.86/83,215.80
  6. Step 6: Final answer
    x = 71,613.82

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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.