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Finding the Fourth Proportional to 85,909.76, 128,167.16 and 81,259.66

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Solution

The fourth proportional to 85,909.76, 128,167.16 and 81,259.66 is: 121,229.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,909.76 : 128,167.16 = 81,259.66 : x
  2. Step 2: Convert to fraction form
    85,909.76/128,167.16 = 81,259.66/x
  3. Step 3: Cross multiply
    85,909.76x = 128,167.16 × 81,259.66
  4. Step 4: Simplify right side
    85,909.76x = 10,414,819,334.82
  5. Step 5: Solve for x
    x = 10,414,819,334.82/85,909.76
  6. Step 6: Final answer
    x = 121,229.75

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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.