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Finding the Fourth Proportional to 215.56, 322.65 and 169.21

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Solution

The fourth proportional to 215.56, 322.65 and 169.21 is: 253.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.56 : 322.65 = 169.21 : x
  2. Step 2: Convert to fraction form
    215.56/322.65 = 169.21/x
  3. Step 3: Cross multiply
    215.56x = 322.65 × 169.21
  4. Step 4: Simplify right side
    215.56x = 54,595.61
  5. Step 5: Solve for x
    x = 54,595.61/215.56
  6. Step 6: Final answer
    x = 253.27

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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.