Home / 8,781.90-12,115.64-5,418.88

Finding the Fourth Proportional to 8,781.90, 12,115.64 and 5,418.88

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Solution

The fourth proportional to 8,781.90, 12,115.64 and 5,418.88 is: 7,475.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,781.90 : 12,115.64 = 5,418.88 : x
  2. Step 2: Convert to fraction form
    8,781.90/12,115.64 = 5,418.88/x
  3. Step 3: Cross multiply
    8,781.90x = 12,115.64 × 5,418.88
  4. Step 4: Simplify right side
    8,781.90x = 65,653,199.28
  5. Step 5: Solve for x
    x = 65,653,199.28/8,781.90
  6. Step 6: Final answer
    x = 7,475.97

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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.