Home / 27,720.90-38,257.11-15,787.98

Finding the Fourth Proportional to 27,720.90, 38,257.11 and 15,787.98

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Solution

The fourth proportional to 27,720.90, 38,257.11 and 15,787.98 is: 21,788.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,720.90 : 38,257.11 = 15,787.98 : x
  2. Step 2: Convert to fraction form
    27,720.90/38,257.11 = 15,787.98/x
  3. Step 3: Cross multiply
    27,720.90x = 38,257.11 × 15,787.98
  4. Step 4: Simplify right side
    27,720.90x = 604,002,487.54
  5. Step 5: Solve for x
    x = 604,002,487.54/27,720.90
  6. Step 6: Final answer
    x = 21,788.70

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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.