Home / 10,086.30-15,129.45-5,420.70

Finding the Fourth Proportional to 10,086.30, 15,129.45 and 5,420.70

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Solution

The fourth proportional to 10,086.30, 15,129.45 and 5,420.70 is: 8,131.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,086.30 : 15,129.45 = 5,420.70 : x
  2. Step 2: Convert to fraction form
    10,086.30/15,129.45 = 5,420.70/x
  3. Step 3: Cross multiply
    10,086.30x = 15,129.45 × 5,420.70
  4. Step 4: Simplify right side
    10,086.30x = 82,012,209.62
  5. Step 5: Solve for x
    x = 82,012,209.62/10,086.30
  6. Step 6: Final answer
    x = 8,131.05

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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.