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Finding the Fourth Proportional to 8,515.75, 12,781.38 and 4,358.63

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Solution

The fourth proportional to 8,515.75, 12,781.38 and 4,358.63 is: 6,541.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,515.75 : 12,781.38 = 4,358.63 : x
  2. Step 2: Convert to fraction form
    8,515.75/12,781.38 = 4,358.63/x
  3. Step 3: Cross multiply
    8,515.75x = 12,781.38 × 4,358.63
  4. Step 4: Simplify right side
    8,515.75x = 55,709,306.31
  5. Step 5: Solve for x
    x = 55,709,306.31/8,515.75
  6. Step 6: Final answer
    x = 6,541.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.