Home / 18,374.28-25,356.32-9,990.78

Finding the Fourth Proportional to 18,374.28, 25,356.32 and 9,990.78

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Solution

The fourth proportional to 18,374.28, 25,356.32 and 9,990.78 is: 13,787.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,374.28 : 25,356.32 = 9,990.78 : x
  2. Step 2: Convert to fraction form
    18,374.28/25,356.32 = 9,990.78/x
  3. Step 3: Cross multiply
    18,374.28x = 25,356.32 × 9,990.78
  4. Step 4: Simplify right side
    18,374.28x = 253,329,414.73
  5. Step 5: Solve for x
    x = 253,329,414.73/18,374.28
  6. Step 6: Final answer
    x = 13,787.18

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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.