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Finding the Fourth Proportional to 215.47, 323.20 and 53.15

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Solution

The fourth proportional to 215.47, 323.20 and 53.15 is: 79.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.47 : 323.20 = 53.15 : x
  2. Step 2: Convert to fraction form
    215.47/323.20 = 53.15/x
  3. Step 3: Cross multiply
    215.47x = 323.20 × 53.15
  4. Step 4: Simplify right side
    215.47x = 17,178.05
  5. Step 5: Solve for x
    x = 17,178.05/215.47
  6. Step 6: Final answer
    x = 79.73

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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.