Home / 20,718.71-28,591.95-11,287.28

Finding the Fourth Proportional to 20,718.71, 28,591.95 and 11,287.28

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Solution

The fourth proportional to 20,718.71, 28,591.95 and 11,287.28 is: 15,576.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,718.71 : 28,591.95 = 11,287.28 : x
  2. Step 2: Convert to fraction form
    20,718.71/28,591.95 = 11,287.28/x
  3. Step 3: Cross multiply
    20,718.71x = 28,591.95 × 11,287.28
  4. Step 4: Simplify right side
    20,718.71x = 322,725,202.44
  5. Step 5: Solve for x
    x = 322,725,202.44/20,718.71
  6. Step 6: Final answer
    x = 15,576.51

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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.