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Finding the Fourth Proportional to 391.44, 542.66 and 370.63

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Solution

The fourth proportional to 391.44, 542.66 and 370.63 is: 513.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.44 : 542.66 = 370.63 : x
  2. Step 2: Convert to fraction form
    391.44/542.66 = 370.63/x
  3. Step 3: Cross multiply
    391.44x = 542.66 × 370.63
  4. Step 4: Simplify right side
    391.44x = 201,126.29
  5. Step 5: Solve for x
    x = 201,126.29/391.44
  6. Step 6: Final answer
    x = 513.81

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.