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Finding the Fourth Proportional to 8,125.79, 12,117.65 and 7,229.79

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Solution

The fourth proportional to 8,125.79, 12,117.65 and 7,229.79 is: 10,781.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,125.79 : 12,117.65 = 7,229.79 : x
  2. Step 2: Convert to fraction form
    8,125.79/12,117.65 = 7,229.79/x
  3. Step 3: Cross multiply
    8,125.79x = 12,117.65 × 7,229.79
  4. Step 4: Simplify right side
    8,125.79x = 87,608,028.64
  5. Step 5: Solve for x
    x = 87,608,028.64/8,125.79
  6. Step 6: Final answer
    x = 10,781.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.