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Finding the Fourth Proportional to 83,009.40, 124,514.10 and 20,679.90

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Solution

The fourth proportional to 83,009.40, 124,514.10 and 20,679.90 is: 31,019.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,009.40 : 124,514.10 = 20,679.90 : x
  2. Step 2: Convert to fraction form
    83,009.40/124,514.10 = 20,679.90/x
  3. Step 3: Cross multiply
    83,009.40x = 124,514.10 × 20,679.90
  4. Step 4: Simplify right side
    83,009.40x = 2,574,939,136.59
  5. Step 5: Solve for x
    x = 2,574,939,136.59/83,009.40
  6. Step 6: Final answer
    x = 31,019.85

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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.