Home / 20,391.28-28,143.12-11,442.40

Finding the Fourth Proportional to 20,391.28, 28,143.12 and 11,442.40

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Solution

The fourth proportional to 20,391.28, 28,143.12 and 11,442.40 is: 15,792.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.28 : 28,143.12 = 11,442.40 : x
  2. Step 2: Convert to fraction form
    20,391.28/28,143.12 = 11,442.40/x
  3. Step 3: Cross multiply
    20,391.28x = 28,143.12 × 11,442.40
  4. Step 4: Simplify right side
    20,391.28x = 322,024,836.29
  5. Step 5: Solve for x
    x = 322,024,836.29/20,391.28
  6. Step 6: Final answer
    x = 15,792.28

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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.