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Finding the Fourth Proportional to 215.46, 323.16 and 99.90

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Solution

The fourth proportional to 215.46, 323.16 and 99.90 is: 149.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.46 : 323.16 = 99.90 : x
  2. Step 2: Convert to fraction form
    215.46/323.16 = 99.90/x
  3. Step 3: Cross multiply
    215.46x = 323.16 × 99.90
  4. Step 4: Simplify right side
    215.46x = 32,283.68
  5. Step 5: Solve for x
    x = 32,283.68/215.46
  6. Step 6: Final answer
    x = 149.84

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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.