Home / 13,155.20-18,146.42-9,115.74

Finding the Fourth Proportional to 13,155.20, 18,146.42 and 9,115.74

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Solution

The fourth proportional to 13,155.20, 18,146.42 and 9,115.74 is: 12,574.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,155.20 : 18,146.42 = 9,115.74 : x
  2. Step 2: Convert to fraction form
    13,155.20/18,146.42 = 9,115.74/x
  3. Step 3: Cross multiply
    13,155.20x = 18,146.42 × 9,115.74
  4. Step 4: Simplify right side
    13,155.20x = 165,418,046.65
  5. Step 5: Solve for x
    x = 165,418,046.65/13,155.20
  6. Step 6: Final answer
    x = 12,574.35

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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.