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Finding the Fourth Proportional to 261.65, 361.07 and 145.22

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Solution

The fourth proportional to 261.65, 361.07 and 145.22 is: 200.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.65 : 361.07 = 145.22 : x
  2. Step 2: Convert to fraction form
    261.65/361.07 = 145.22/x
  3. Step 3: Cross multiply
    261.65x = 361.07 × 145.22
  4. Step 4: Simplify right side
    261.65x = 52,433.86
  5. Step 5: Solve for x
    x = 52,433.86/261.65
  6. Step 6: Final answer
    x = 200.40

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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.