Home / 15,717.12-21,689.88-8,643.48

Finding the Fourth Proportional to 15,717.12, 21,689.88 and 8,643.48

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Solution

The fourth proportional to 15,717.12, 21,689.88 and 8,643.48 is: 11,928.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,717.12 : 21,689.88 = 8,643.48 : x
  2. Step 2: Convert to fraction form
    15,717.12/21,689.88 = 8,643.48/x
  3. Step 3: Cross multiply
    15,717.12x = 21,689.88 × 8,643.48
  4. Step 4: Simplify right side
    15,717.12x = 187,476,043.98
  5. Step 5: Solve for x
    x = 187,476,043.98/15,717.12
  6. Step 6: Final answer
    x = 11,928.14

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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.