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Finding the Fourth Proportional to 15,721.41, 21,695.88 and 8,647.83

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Solution

The fourth proportional to 15,721.41, 21,695.88 and 8,647.83 is: 11,934.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,721.41 : 21,695.88 = 8,647.83 : x
  2. Step 2: Convert to fraction form
    15,721.41/21,695.88 = 8,647.83/x
  3. Step 3: Cross multiply
    15,721.41x = 21,695.88 × 8,647.83
  4. Step 4: Simplify right side
    15,721.41x = 187,622,281.94
  5. Step 5: Solve for x
    x = 187,622,281.94/15,721.41
  6. Step 6: Final answer
    x = 11,934.19

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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.