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Finding the Fourth Proportional to 215.52, 322.79 and 99.79

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Solution

The fourth proportional to 215.52, 322.79 and 99.79 is: 149.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.52 : 322.79 = 99.79 : x
  2. Step 2: Convert to fraction form
    215.52/322.79 = 99.79/x
  3. Step 3: Cross multiply
    215.52x = 322.79 × 99.79
  4. Step 4: Simplify right side
    215.52x = 32,209.91
  5. Step 5: Solve for x
    x = 32,209.91/215.52
  6. Step 6: Final answer
    x = 149.45

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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.