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Finding the Fourth Proportional to 215.47, 322.68 and 138.19

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Solution

The fourth proportional to 215.47, 322.68 and 138.19 is: 206.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.47 : 322.68 = 138.19 : x
  2. Step 2: Convert to fraction form
    215.47/322.68 = 138.19/x
  3. Step 3: Cross multiply
    215.47x = 322.68 × 138.19
  4. Step 4: Simplify right side
    215.47x = 44,591.15
  5. Step 5: Solve for x
    x = 44,591.15/215.47
  6. Step 6: Final answer
    x = 206.95

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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.