Home / 15,713.40-21,684.57-8,640.28

Finding the Fourth Proportional to 15,713.40, 21,684.57 and 8,640.28

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Solution

The fourth proportional to 15,713.40, 21,684.57 and 8,640.28 is: 11,923.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,713.40 : 21,684.57 = 8,640.28 : x
  2. Step 2: Convert to fraction form
    15,713.40/21,684.57 = 8,640.28/x
  3. Step 3: Cross multiply
    15,713.40x = 21,684.57 × 8,640.28
  4. Step 4: Simplify right side
    15,713.40x = 187,360,648.06
  5. Step 5: Solve for x
    x = 187,360,648.06/15,713.40
  6. Step 6: Final answer
    x = 11,923.62

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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.