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Finding the Fourth Proportional to 83,010.40, 124,515.60 and 20,680.90

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Solution

The fourth proportional to 83,010.40, 124,515.60 and 20,680.90 is: 31,021.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,010.40 : 124,515.60 = 20,680.90 : x
  2. Step 2: Convert to fraction form
    83,010.40/124,515.60 = 20,680.90/x
  3. Step 3: Cross multiply
    83,010.40x = 124,515.60 × 20,680.90
  4. Step 4: Simplify right side
    83,010.40x = 2,575,094,672.04
  5. Step 5: Solve for x
    x = 2,575,094,672.04/83,010.40
  6. Step 6: Final answer
    x = 31,021.35

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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.