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Finding the Fourth Proportional to 1,242.78, 1,864.36 and 409.58

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Solution

The fourth proportional to 1,242.78, 1,864.36 and 409.58 is: 614.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.78 : 1,864.36 = 409.58 : x
  2. Step 2: Convert to fraction form
    1,242.78/1,864.36 = 409.58/x
  3. Step 3: Cross multiply
    1,242.78x = 1,864.36 × 409.58
  4. Step 4: Simplify right side
    1,242.78x = 763,604.57
  5. Step 5: Solve for x
    x = 763,604.57/1,242.78
  6. Step 6: Final answer
    x = 614.43

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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.