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Finding the Fourth Proportional to 8,781.41, 12,114.95 and 5,418.38

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Solution

The fourth proportional to 8,781.41, 12,114.95 and 5,418.38 is: 7,475.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,781.41 : 12,114.95 = 5,418.38 : x
  2. Step 2: Convert to fraction form
    8,781.41/12,114.95 = 5,418.38/x
  3. Step 3: Cross multiply
    8,781.41x = 12,114.95 × 5,418.38
  4. Step 4: Simplify right side
    8,781.41x = 65,643,315.11
  5. Step 5: Solve for x
    x = 65,643,315.11/8,781.41
  6. Step 6: Final answer
    x = 7,475.26

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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.