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Finding the Fourth Proportional to 1,242.16, 1,864.02 and 721.84

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Solution

The fourth proportional to 1,242.16, 1,864.02 and 721.84 is: 1,083.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.16 : 1,864.02 = 721.84 : x
  2. Step 2: Convert to fraction form
    1,242.16/1,864.02 = 721.84/x
  3. Step 3: Cross multiply
    1,242.16x = 1,864.02 × 721.84
  4. Step 4: Simplify right side
    1,242.16x = 1,345,524.20
  5. Step 5: Solve for x
    x = 1,345,524.20/1,242.16
  6. Step 6: Final answer
    x = 1,083.21

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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.