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Finding the Fourth Proportional to 261.95, 361.47 and 145.50

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Solution

The fourth proportional to 261.95, 361.47 and 145.50 is: 200.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.95 : 361.47 = 145.50 : x
  2. Step 2: Convert to fraction form
    261.95/361.47 = 145.50/x
  3. Step 3: Cross multiply
    261.95x = 361.47 × 145.50
  4. Step 4: Simplify right side
    261.95x = 52,593.89
  5. Step 5: Solve for x
    x = 52,593.89/261.95
  6. Step 6: Final answer
    x = 200.78

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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.