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Finding the Fourth Proportional to 85,785.80, 128,691.12 and 26,626.25

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Solution

The fourth proportional to 85,785.80, 128,691.12 and 26,626.25 is: 39,943.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,785.80 : 128,691.12 = 26,626.25 : x
  2. Step 2: Convert to fraction form
    85,785.80/128,691.12 = 26,626.25/x
  3. Step 3: Cross multiply
    85,785.80x = 128,691.12 × 26,626.25
  4. Step 4: Simplify right side
    85,785.80x = 3,426,561,933.90
  5. Step 5: Solve for x
    x = 3,426,561,933.90/85,785.80
  6. Step 6: Final answer
    x = 39,943.23

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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.