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Finding the Fourth Proportional to 261.95, 360.23 and 211.55

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Solution

The fourth proportional to 261.95, 360.23 and 211.55 is: 290.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.95 : 360.23 = 211.55 : x
  2. Step 2: Convert to fraction form
    261.95/360.23 = 211.55/x
  3. Step 3: Cross multiply
    261.95x = 360.23 × 211.55
  4. Step 4: Simplify right side
    261.95x = 76,203.80
  5. Step 5: Solve for x
    x = 76,203.80/261.95
  6. Step 6: Final answer
    x = 290.92

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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.