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Finding the Fourth Proportional to 261.63, 361.05 and 156.73

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Solution

The fourth proportional to 261.63, 361.05 and 156.73 is: 216.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.63 : 361.05 = 156.73 : x
  2. Step 2: Convert to fraction form
    261.63/361.05 = 156.73/x
  3. Step 3: Cross multiply
    261.63x = 361.05 × 156.73
  4. Step 4: Simplify right side
    261.63x = 56,587.37
  5. Step 5: Solve for x
    x = 56,587.37/261.63
  6. Step 6: Final answer
    x = 216.29

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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.