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Finding the Fourth Proportional to 85,789.80, 128,697.12 and 26,630.28

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Solution

The fourth proportional to 85,789.80, 128,697.12 and 26,630.28 is: 39,949.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,789.80 : 128,697.12 = 26,630.28 : x
  2. Step 2: Convert to fraction form
    85,789.80/128,697.12 = 26,630.28/x
  3. Step 3: Cross multiply
    85,789.80x = 128,697.12 × 26,630.28
  4. Step 4: Simplify right side
    85,789.80x = 3,427,240,340.79
  5. Step 5: Solve for x
    x = 3,427,240,340.79/85,789.80
  6. Step 6: Final answer
    x = 39,949.28

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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.