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Finding the Fourth Proportional to 215.76, 322.12 and 191.52

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Solution

The fourth proportional to 215.76, 322.12 and 191.52 is: 285.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.76 : 322.12 = 191.52 : x
  2. Step 2: Convert to fraction form
    215.76/322.12 = 191.52/x
  3. Step 3: Cross multiply
    215.76x = 322.12 × 191.52
  4. Step 4: Simplify right side
    215.76x = 61,692.42
  5. Step 5: Solve for x
    x = 61,692.42/215.76
  6. Step 6: Final answer
    x = 285.93

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.