Home / 11,145.18-15,380.67-6,429.78

Finding the Fourth Proportional to 11,145.18, 15,380.67 and 6,429.78

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Solution

The fourth proportional to 11,145.18, 15,380.67 and 6,429.78 is: 8,873.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,145.18 : 15,380.67 = 6,429.78 : x
  2. Step 2: Convert to fraction form
    11,145.18/15,380.67 = 6,429.78/x
  3. Step 3: Cross multiply
    11,145.18x = 15,380.67 × 6,429.78
  4. Step 4: Simplify right side
    11,145.18x = 98,894,324.35
  5. Step 5: Solve for x
    x = 98,894,324.35/11,145.18
  6. Step 6: Final answer
    x = 8,873.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.