Home / 15,717.40-21,689.84-8,643.92

Finding the Fourth Proportional to 15,717.40, 21,689.84 and 8,643.92

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Solution

The fourth proportional to 15,717.40, 21,689.84 and 8,643.92 is: 11,928.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,717.40 : 21,689.84 = 8,643.92 : x
  2. Step 2: Convert to fraction form
    15,717.40/21,689.84 = 8,643.92/x
  3. Step 3: Cross multiply
    15,717.40x = 21,689.84 × 8,643.92
  4. Step 4: Simplify right side
    15,717.40x = 187,485,241.77
  5. Step 5: Solve for x
    x = 187,485,241.77/15,717.40
  6. Step 6: Final answer
    x = 11,928.52

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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.