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Finding the Fourth Proportional to 85,843.90, 128,765.85 and 26,679.10

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Solution

The fourth proportional to 85,843.90, 128,765.85 and 26,679.10 is: 40,018.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,843.90 : 128,765.85 = 26,679.10 : x
  2. Step 2: Convert to fraction form
    85,843.90/128,765.85 = 26,679.10/x
  3. Step 3: Cross multiply
    85,843.90x = 128,765.85 × 26,679.10
  4. Step 4: Simplify right side
    85,843.90x = 3,435,356,988.74
  5. Step 5: Solve for x
    x = 3,435,356,988.74/85,843.90
  6. Step 6: Final answer
    x = 40,018.65

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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.