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Finding the Fourth Proportional to 215.15, 322.61 and 99.65

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Solution

The fourth proportional to 215.15, 322.61 and 99.65 is: 149.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.15 : 322.61 = 99.65 : x
  2. Step 2: Convert to fraction form
    215.15/322.61 = 99.65/x
  3. Step 3: Cross multiply
    215.15x = 322.61 × 99.65
  4. Step 4: Simplify right side
    215.15x = 32,145.98
  5. Step 5: Solve for x
    x = 32,145.98/215.15
  6. Step 6: Final answer
    x = 149.42

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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.