Home / 15,721.13-21,695.76-8,647.40

Finding the Fourth Proportional to 15,721.13, 21,695.76 and 8,647.40

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Solution

The fourth proportional to 15,721.13, 21,695.76 and 8,647.40 is: 11,933.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,721.13 : 21,695.76 = 8,647.40 : x
  2. Step 2: Convert to fraction form
    15,721.13/21,695.76 = 8,647.40/x
  3. Step 3: Cross multiply
    15,721.13x = 21,695.76 × 8,647.40
  4. Step 4: Simplify right side
    15,721.13x = 187,611,806.55
  5. Step 5: Solve for x
    x = 187,611,806.55/15,721.13
  6. Step 6: Final answer
    x = 11,933.74

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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.