Home / 15,780.57-21,777.28-8,610.40

Finding the Fourth Proportional to 15,780.57, 21,777.28 and 8,610.40

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Solution

The fourth proportional to 15,780.57, 21,777.28 and 8,610.40 is: 11,882.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.57 : 21,777.28 = 8,610.40 : x
  2. Step 2: Convert to fraction form
    15,780.57/21,777.28 = 8,610.40/x
  3. Step 3: Cross multiply
    15,780.57x = 21,777.28 × 8,610.40
  4. Step 4: Simplify right side
    15,780.57x = 187,511,121.62
  5. Step 5: Solve for x
    x = 187,511,121.62/15,780.57
  6. Step 6: Final answer
    x = 11,882.40

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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.