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Finding the Fourth Proportional to 215.86, 323.88 and 147.46

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Solution

The fourth proportional to 215.86, 323.88 and 147.46 is: 221.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.86 : 323.88 = 147.46 : x
  2. Step 2: Convert to fraction form
    215.86/323.88 = 147.46/x
  3. Step 3: Cross multiply
    215.86x = 323.88 × 147.46
  4. Step 4: Simplify right side
    215.86x = 47,759.34
  5. Step 5: Solve for x
    x = 47,759.34/215.86
  6. Step 6: Final answer
    x = 221.25

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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.