Home / 15,720.72-21,693.28-8,647.52

Finding the Fourth Proportional to 15,720.72, 21,693.28 and 8,647.52

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Solution

The fourth proportional to 15,720.72, 21,693.28 and 8,647.52 is: 11,932.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.72 : 21,693.28 = 8,647.52 : x
  2. Step 2: Convert to fraction form
    15,720.72/21,693.28 = 8,647.52/x
  3. Step 3: Cross multiply
    15,720.72x = 21,693.28 × 8,647.52
  4. Step 4: Simplify right side
    15,720.72x = 187,593,072.67
  5. Step 5: Solve for x
    x = 187,593,072.67/15,720.72
  6. Step 6: Final answer
    x = 11,932.86

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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.