Home / 5,420.13-8,129.29-1,909.31

Finding the Fourth Proportional to 5,420.13, 8,129.29 and 1,909.31

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Solution

The fourth proportional to 5,420.13, 8,129.29 and 1,909.31 is: 2,863.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.13 : 8,129.29 = 1,909.31 : x
  2. Step 2: Convert to fraction form
    5,420.13/8,129.29 = 1,909.31/x
  3. Step 3: Cross multiply
    5,420.13x = 8,129.29 × 1,909.31
  4. Step 4: Simplify right side
    5,420.13x = 15,521,340.68
  5. Step 5: Solve for x
    x = 15,521,340.68/5,420.13
  6. Step 6: Final answer
    x = 2,863.65

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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.