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Finding the Fourth Proportional to 1,238.41, 1,858.44 and 931

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Solution

The fourth proportional to 1,238.41, 1,858.44 and 931 is: 1,397.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.41 : 1,858.44 = 931 : x
  2. Step 2: Convert to fraction form
    1,238.41/1,858.44 = 931/x
  3. Step 3: Cross multiply
    1,238.41x = 1,858.44 × 931
  4. Step 4: Simplify right side
    1,238.41x = 1,730,207.64
  5. Step 5: Solve for x
    x = 1,730,207.64/1,238.41
  6. Step 6: Final answer
    x = 1,397.12

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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.