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Finding the Fourth Proportional to 28,443.17, 42,665.36 and 8,721.29

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Solution

The fourth proportional to 28,443.17, 42,665.36 and 8,721.29 is: 13,082.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,443.17 : 42,665.36 = 8,721.29 : x
  2. Step 2: Convert to fraction form
    28,443.17/42,665.36 = 8,721.29/x
  3. Step 3: Cross multiply
    28,443.17x = 42,665.36 × 8,721.29
  4. Step 4: Simplify right side
    28,443.17x = 372,096,785.99
  5. Step 5: Solve for x
    x = 372,096,785.99/28,443.17
  6. Step 6: Final answer
    x = 13,082.12

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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.