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Finding the Fourth Proportional to 854.47, 1,281.78 and 238.18

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Solution

The fourth proportional to 854.47, 1,281.78 and 238.18 is: 357.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.47 : 1,281.78 = 238.18 : x
  2. Step 2: Convert to fraction form
    854.47/1,281.78 = 238.18/x
  3. Step 3: Cross multiply
    854.47x = 1,281.78 × 238.18
  4. Step 4: Simplify right side
    854.47x = 305,293.17
  5. Step 5: Solve for x
    x = 305,293.17/854.47
  6. Step 6: Final answer
    x = 357.29

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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.