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Finding the Fourth Proportional to 13,118.15, 18,102.84 and 7,149.87

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Solution

The fourth proportional to 13,118.15, 18,102.84 and 7,149.87 is: 9,866.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,118.15 : 18,102.84 = 7,149.87 : x
  2. Step 2: Convert to fraction form
    13,118.15/18,102.84 = 7,149.87/x
  3. Step 3: Cross multiply
    13,118.15x = 18,102.84 × 7,149.87
  4. Step 4: Simplify right side
    13,118.15x = 129,432,966.04
  5. Step 5: Solve for x
    x = 129,432,966.04/13,118.15
  6. Step 6: Final answer
    x = 9,866.71

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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.