Home / 15,721.12-21,695.50-8,647.92

Finding the Fourth Proportional to 15,721.12, 21,695.50 and 8,647.92

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Solution

The fourth proportional to 15,721.12, 21,695.50 and 8,647.92 is: 11,934.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,721.12 : 21,695.50 = 8,647.92 : x
  2. Step 2: Convert to fraction form
    15,721.12/21,695.50 = 8,647.92/x
  3. Step 3: Cross multiply
    15,721.12x = 21,695.50 × 8,647.92
  4. Step 4: Simplify right side
    15,721.12x = 187,620,948.36
  5. Step 5: Solve for x
    x = 187,620,948.36/15,721.12
  6. Step 6: Final answer
    x = 11,934.32

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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.