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Finding the Fourth Proportional to 261.16, 391.20 and 203.14

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Solution

The fourth proportional to 261.16, 391.20 and 203.14 is: 304.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.16 : 391.20 = 203.14 : x
  2. Step 2: Convert to fraction form
    261.16/391.20 = 203.14/x
  3. Step 3: Cross multiply
    261.16x = 391.20 × 203.14
  4. Step 4: Simplify right side
    261.16x = 79,468.37
  5. Step 5: Solve for x
    x = 79,468.37/261.16
  6. Step 6: Final answer
    x = 304.29

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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.