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Finding the Fourth Proportional to 215.68, 321.28 and 203.52

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Solution

The fourth proportional to 215.68, 321.28 and 203.52 is: 303.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.68 : 321.28 = 203.52 : x
  2. Step 2: Convert to fraction form
    215.68/321.28 = 203.52/x
  3. Step 3: Cross multiply
    215.68x = 321.28 × 203.52
  4. Step 4: Simplify right side
    215.68x = 65,386.91
  5. Step 5: Solve for x
    x = 65,386.91/215.68
  6. Step 6: Final answer
    x = 303.17

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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.