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Finding the Fourth Proportional to 578.18, 867.28 and 231.72

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Solution

The fourth proportional to 578.18, 867.28 and 231.72 is: 347.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.18 : 867.28 = 231.72 : x
  2. Step 2: Convert to fraction form
    578.18/867.28 = 231.72/x
  3. Step 3: Cross multiply
    578.18x = 867.28 × 231.72
  4. Step 4: Simplify right side
    578.18x = 200,966.12
  5. Step 5: Solve for x
    x = 200,966.12/578.18
  6. Step 6: Final answer
    x = 347.58

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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.