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Finding the Fourth Proportional to 215.76, 321.76 and 187.04

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Solution

The fourth proportional to 215.76, 321.76 and 187.04 is: 278.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.76 : 321.76 = 187.04 : x
  2. Step 2: Convert to fraction form
    215.76/321.76 = 187.04/x
  3. Step 3: Cross multiply
    215.76x = 321.76 × 187.04
  4. Step 4: Simplify right side
    215.76x = 60,181.99
  5. Step 5: Solve for x
    x = 60,181.99/215.76
  6. Step 6: Final answer
    x = 278.93

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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.