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Finding the Fourth Proportional to 1,239.27, 1,858.42 and 361.48

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Solution

The fourth proportional to 1,239.27, 1,858.42 and 361.48 is: 542.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.27 : 1,858.42 = 361.48 : x
  2. Step 2: Convert to fraction form
    1,239.27/1,858.42 = 361.48/x
  3. Step 3: Cross multiply
    1,239.27x = 1,858.42 × 361.48
  4. Step 4: Simplify right side
    1,239.27x = 671,781.66
  5. Step 5: Solve for x
    x = 671,781.66/1,239.27
  6. Step 6: Final answer
    x = 542.08

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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.