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Finding the Fourth Proportional to 18,374.52, 25,356.84 and 9,991

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Solution

The fourth proportional to 18,374.52, 25,356.84 and 9,991 is: 13,787.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,374.52 : 25,356.84 = 9,991 : x
  2. Step 2: Convert to fraction form
    18,374.52/25,356.84 = 9,991/x
  3. Step 3: Cross multiply
    18,374.52x = 25,356.84 × 9,991
  4. Step 4: Simplify right side
    18,374.52x = 253,340,188.44
  5. Step 5: Solve for x
    x = 253,340,188.44/18,374.52
  6. Step 6: Final answer
    x = 13,787.58

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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.