Home / 15,717.30-21,690.28-8,643.90

Finding the Fourth Proportional to 15,717.30, 21,690.28 and 8,643.90

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Solution

The fourth proportional to 15,717.30, 21,690.28 and 8,643.90 is: 11,928.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,717.30 : 21,690.28 = 8,643.90 : x
  2. Step 2: Convert to fraction form
    15,717.30/21,690.28 = 8,643.90/x
  3. Step 3: Cross multiply
    15,717.30x = 21,690.28 × 8,643.90
  4. Step 4: Simplify right side
    15,717.30x = 187,488,611.29
  5. Step 5: Solve for x
    x = 187,488,611.29/15,717.30
  6. Step 6: Final answer
    x = 11,928.81

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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.