Home / 15,787.61-21,777.15-9,409.91

Finding the Fourth Proportional to 15,787.61, 21,777.15 and 9,409.91

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Solution

The fourth proportional to 15,787.61, 21,777.15 and 9,409.91 is: 12,979.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,787.61 : 21,777.15 = 9,409.91 : x
  2. Step 2: Convert to fraction form
    15,787.61/21,777.15 = 9,409.91/x
  3. Step 3: Cross multiply
    15,787.61x = 21,777.15 × 9,409.91
  4. Step 4: Simplify right side
    15,787.61x = 204,920,947.96
  5. Step 5: Solve for x
    x = 204,920,947.96/15,787.61
  6. Step 6: Final answer
    x = 12,979.86

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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.