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Finding the Fourth Proportional to 85,920.75, 128,708.67 and 43,799.13

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Solution

The fourth proportional to 85,920.75, 128,708.67 and 43,799.13 is: 65,610.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.75 : 128,708.67 = 43,799.13 : x
  2. Step 2: Convert to fraction form
    85,920.75/128,708.67 = 43,799.13/x
  3. Step 3: Cross multiply
    85,920.75x = 128,708.67 × 43,799.13
  4. Step 4: Simplify right side
    85,920.75x = 5,637,327,769.46
  5. Step 5: Solve for x
    x = 5,637,327,769.46/85,920.75
  6. Step 6: Final answer
    x = 65,610.78

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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.