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Finding the Fourth Proportional to 391.38, 539.93 and 275.01

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Solution

The fourth proportional to 391.38, 539.93 and 275.01 is: 379.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.38 : 539.93 = 275.01 : x
  2. Step 2: Convert to fraction form
    391.38/539.93 = 275.01/x
  3. Step 3: Cross multiply
    391.38x = 539.93 × 275.01
  4. Step 4: Simplify right side
    391.38x = 148,486.81
  5. Step 5: Solve for x
    x = 148,486.81/391.38
  6. Step 6: Final answer
    x = 379.39

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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.