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Finding the Fourth Proportional to 8,415.78, 11,613.78 and 4,689.78

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Solution

The fourth proportional to 8,415.78, 11,613.78 and 4,689.78 is: 6,471.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,415.78 : 11,613.78 = 4,689.78 : x
  2. Step 2: Convert to fraction form
    8,415.78/11,613.78 = 4,689.78/x
  3. Step 3: Cross multiply
    8,415.78x = 11,613.78 × 4,689.78
  4. Step 4: Simplify right side
    8,415.78x = 54,466,073.17
  5. Step 5: Solve for x
    x = 54,466,073.17/8,415.78
  6. Step 6: Final answer
    x = 6,471.90

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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.