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Finding the Fourth Proportional to 83,128.80, 124,808.40 and 65,618.40

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Solution

The fourth proportional to 83,128.80, 124,808.40 and 65,618.40 is: 98,518.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,128.80 : 124,808.40 = 65,618.40 : x
  2. Step 2: Convert to fraction form
    83,128.80/124,808.40 = 65,618.40/x
  3. Step 3: Cross multiply
    83,128.80x = 124,808.40 × 65,618.40
  4. Step 4: Simplify right side
    83,128.80x = 8,189,727,514.56
  5. Step 5: Solve for x
    x = 8,189,727,514.56/83,128.80
  6. Step 6: Final answer
    x = 98,518.53

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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.