Home / 18,715.38-25,815.90-11,156.66

Finding the Fourth Proportional to 18,715.38, 25,815.90 and 11,156.66

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Solution

The fourth proportional to 18,715.38, 25,815.90 and 11,156.66 is: 15,389.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.38 : 25,815.90 = 11,156.66 : x
  2. Step 2: Convert to fraction form
    18,715.38/25,815.90 = 11,156.66/x
  3. Step 3: Cross multiply
    18,715.38x = 25,815.90 × 11,156.66
  4. Step 4: Simplify right side
    18,715.38x = 288,019,218.89
  5. Step 5: Solve for x
    x = 288,019,218.89/18,715.38
  6. Step 6: Final answer
    x = 15,389.44

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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.