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Finding the Fourth Proportional to 18,374.34, 25,356.60 and 9,990.84

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Solution

The fourth proportional to 18,374.34, 25,356.60 and 9,990.84 is: 13,787.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,374.34 : 25,356.60 = 9,990.84 : x
  2. Step 2: Convert to fraction form
    18,374.34/25,356.60 = 9,990.84/x
  3. Step 3: Cross multiply
    18,374.34x = 25,356.60 × 9,990.84
  4. Step 4: Simplify right side
    18,374.34x = 253,333,733.54
  5. Step 5: Solve for x
    x = 253,333,733.54/18,374.34
  6. Step 6: Final answer
    x = 13,787.37

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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.