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Finding the Fourth Proportional to 261.94, 361.32 and 215.53

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Solution

The fourth proportional to 261.94, 361.32 and 215.53 is: 297.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.94 : 361.32 = 215.53 : x
  2. Step 2: Convert to fraction form
    261.94/361.32 = 215.53/x
  3. Step 3: Cross multiply
    261.94x = 361.32 × 215.53
  4. Step 4: Simplify right side
    261.94x = 77,874.40
  5. Step 5: Solve for x
    x = 77,874.40/261.94
  6. Step 6: Final answer
    x = 297.30

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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.