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Finding the Fourth Proportional to 391.84, 540.24 and 314.56

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Solution

The fourth proportional to 391.84, 540.24 and 314.56 is: 433.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.84 : 540.24 = 314.56 : x
  2. Step 2: Convert to fraction form
    391.84/540.24 = 314.56/x
  3. Step 3: Cross multiply
    391.84x = 540.24 × 314.56
  4. Step 4: Simplify right side
    391.84x = 169,937.89
  5. Step 5: Solve for x
    x = 169,937.89/391.84
  6. Step 6: Final answer
    x = 433.69

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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.