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Finding the Fourth Proportional to 931.46, 1,397.19 and 238.13

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Solution

The fourth proportional to 931.46, 1,397.19 and 238.13 is: 357.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.46 : 1,397.19 = 238.13 : x
  2. Step 2: Convert to fraction form
    931.46/1,397.19 = 238.13/x
  3. Step 3: Cross multiply
    931.46x = 1,397.19 × 238.13
  4. Step 4: Simplify right side
    931.46x = 332,712.26
  5. Step 5: Solve for x
    x = 332,712.26/931.46
  6. Step 6: Final answer
    x = 357.19

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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.