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Finding the Fourth Proportional to 8,687.74, 13,029.61 and 5,178.74

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Solution

The fourth proportional to 8,687.74, 13,029.61 and 5,178.74 is: 7,766.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.74 : 13,029.61 = 5,178.74 : x
  2. Step 2: Convert to fraction form
    8,687.74/13,029.61 = 5,178.74/x
  3. Step 3: Cross multiply
    8,687.74x = 13,029.61 × 5,178.74
  4. Step 4: Simplify right side
    8,687.74x = 67,476,962.49
  5. Step 5: Solve for x
    x = 67,476,962.49/8,687.74
  6. Step 6: Final answer
    x = 7,766.92

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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.