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Finding the Fourth Proportional to 261.70, 361.15 and 156.79

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Solution

The fourth proportional to 261.70, 361.15 and 156.79 is: 216.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.70 : 361.15 = 156.79 : x
  2. Step 2: Convert to fraction form
    261.70/361.15 = 156.79/x
  3. Step 3: Cross multiply
    261.70x = 361.15 × 156.79
  4. Step 4: Simplify right side
    261.70x = 56,623.92
  5. Step 5: Solve for x
    x = 56,623.92/261.70
  6. Step 6: Final answer
    x = 216.37

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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.