Home / 85,412.90-128,138.55-26,251.30

Finding the Fourth Proportional to 85,412.90, 128,138.55 and 26,251.30

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Solution

The fourth proportional to 85,412.90, 128,138.55 and 26,251.30 is: 39,382.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,412.90 : 128,138.55 = 26,251.30 : x
  2. Step 2: Convert to fraction form
    85,412.90/128,138.55 = 26,251.30/x
  3. Step 3: Cross multiply
    85,412.90x = 128,138.55 × 26,251.30
  4. Step 4: Simplify right side
    85,412.90x = 3,363,803,517.62
  5. Step 5: Solve for x
    x = 3,363,803,517.62/85,412.90
  6. Step 6: Final answer
    x = 39,382.85

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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.