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Finding the Fourth Proportional to 261.60, 361.28 and 215.44

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Solution

The fourth proportional to 261.60, 361.28 and 215.44 is: 297.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.60 : 361.28 = 215.44 : x
  2. Step 2: Convert to fraction form
    261.60/361.28 = 215.44/x
  3. Step 3: Cross multiply
    261.60x = 361.28 × 215.44
  4. Step 4: Simplify right side
    261.60x = 77,834.16
  5. Step 5: Solve for x
    x = 77,834.16/261.60
  6. Step 6: Final answer
    x = 297.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.