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Finding the Fourth Proportional to 85,560.20, 128,340.30 and 77,103.80

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Solution

The fourth proportional to 85,560.20, 128,340.30 and 77,103.80 is: 115,655.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,560.20 : 128,340.30 = 77,103.80 : x
  2. Step 2: Convert to fraction form
    85,560.20/128,340.30 = 77,103.80/x
  3. Step 3: Cross multiply
    85,560.20x = 128,340.30 × 77,103.80
  4. Step 4: Simplify right side
    85,560.20x = 9,895,524,823.14
  5. Step 5: Solve for x
    x = 9,895,524,823.14/85,560.20
  6. Step 6: Final answer
    x = 115,655.70

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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.