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Finding the Fourth Proportional to 215.47, 323.21 and 124.12

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Solution

The fourth proportional to 215.47, 323.21 and 124.12 is: 186.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.47 : 323.21 = 124.12 : x
  2. Step 2: Convert to fraction form
    215.47/323.21 = 124.12/x
  3. Step 3: Cross multiply
    215.47x = 323.21 × 124.12
  4. Step 4: Simplify right side
    215.47x = 40,117.54
  5. Step 5: Solve for x
    x = 40,117.54/215.47
  6. Step 6: Final answer
    x = 186.19

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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.