Home / 8,781.71-12,113.21-6,128.15

Finding the Fourth Proportional to 8,781.71, 12,113.21 and 6,128.15

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Solution

The fourth proportional to 8,781.71, 12,113.21 and 6,128.15 is: 8,452.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,781.71 : 12,113.21 = 6,128.15 : x
  2. Step 2: Convert to fraction form
    8,781.71/12,113.21 = 6,128.15/x
  3. Step 3: Cross multiply
    8,781.71x = 12,113.21 × 6,128.15
  4. Step 4: Simplify right side
    8,781.71x = 74,231,522.62
  5. Step 5: Solve for x
    x = 74,231,522.62/8,781.71
  6. Step 6: Final answer
    x = 8,452.97

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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.