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Finding the Fourth Proportional to 85,863.08, 128,169.21 and 79,531.43

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Solution

The fourth proportional to 85,863.08, 128,169.21 and 79,531.43 is: 118,717.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,863.08 : 128,169.21 = 79,531.43 : x
  2. Step 2: Convert to fraction form
    85,863.08/128,169.21 = 79,531.43/x
  3. Step 3: Cross multiply
    85,863.08x = 128,169.21 × 79,531.43
  4. Step 4: Simplify right side
    85,863.08x = 10,193,480,873.69
  5. Step 5: Solve for x
    x = 10,193,480,873.69/85,863.08
  6. Step 6: Final answer
    x = 118,717.85

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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.