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Finding the Fourth Proportional to 261.38, 391.71 and 189.02

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Solution

The fourth proportional to 261.38, 391.71 and 189.02 is: 283.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.38 : 391.71 = 189.02 : x
  2. Step 2: Convert to fraction form
    261.38/391.71 = 189.02/x
  3. Step 3: Cross multiply
    261.38x = 391.71 × 189.02
  4. Step 4: Simplify right side
    261.38x = 74,041.02
  5. Step 5: Solve for x
    x = 74,041.02/261.38
  6. Step 6: Final answer
    x = 283.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.