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Finding the Fourth Proportional to 18,721.28, 28,062.25 and 7,472.21

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Solution

The fourth proportional to 18,721.28, 28,062.25 and 7,472.21 is: 11,200.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.28 : 28,062.25 = 7,472.21 : x
  2. Step 2: Convert to fraction form
    18,721.28/28,062.25 = 7,472.21/x
  3. Step 3: Cross multiply
    18,721.28x = 28,062.25 × 7,472.21
  4. Step 4: Simplify right side
    18,721.28x = 209,686,866.08
  5. Step 5: Solve for x
    x = 209,686,866.08/18,721.28
  6. Step 6: Final answer
    x = 11,200.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.