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Finding the Fourth Proportional to 261.53, 360.91 and 143.51

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Solution

The fourth proportional to 261.53, 360.91 and 143.51 is: 198.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.53 : 360.91 = 143.51 : x
  2. Step 2: Convert to fraction form
    261.53/360.91 = 143.51/x
  3. Step 3: Cross multiply
    261.53x = 360.91 × 143.51
  4. Step 4: Simplify right side
    261.53x = 51,791.67
  5. Step 5: Solve for x
    x = 51,791.67/261.53
  6. Step 6: Final answer
    x = 198.04

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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.