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Finding the Fourth Proportional to 8,637, 12,939.78 and 3,960.90

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Solution

The fourth proportional to 8,637, 12,939.78 and 3,960.90 is: 5,934.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,637 : 12,939.78 = 3,960.90 : x
  2. Step 2: Convert to fraction form
    8,637/12,939.78 = 3,960.90/x
  3. Step 3: Cross multiply
    8,637x = 12,939.78 × 3,960.90
  4. Step 4: Simplify right side
    8,637x = 51,253,174.60
  5. Step 5: Solve for x
    x = 51,253,174.60/8,637
  6. Step 6: Final answer
    x = 5,934.14

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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.