Home / 20,345.10-28,073.78-11,391.90

Finding the Fourth Proportional to 20,345.10, 28,073.78 and 11,391.90

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Solution

The fourth proportional to 20,345.10, 28,073.78 and 11,391.90 is: 15,719.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,345.10 : 28,073.78 = 11,391.90 : x
  2. Step 2: Convert to fraction form
    20,345.10/28,073.78 = 11,391.90/x
  3. Step 3: Cross multiply
    20,345.10x = 28,073.78 × 11,391.90
  4. Step 4: Simplify right side
    20,345.10x = 319,813,694.38
  5. Step 5: Solve for x
    x = 319,813,694.38/20,345.10
  6. Step 6: Final answer
    x = 15,719.45

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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.