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Finding the Fourth Proportional to 391.53, 540.24 and 251.60

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Solution

The fourth proportional to 391.53, 540.24 and 251.60 is: 347.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.53 : 540.24 = 251.60 : x
  2. Step 2: Convert to fraction form
    391.53/540.24 = 251.60/x
  3. Step 3: Cross multiply
    391.53x = 540.24 × 251.60
  4. Step 4: Simplify right side
    391.53x = 135,924.38
  5. Step 5: Solve for x
    x = 135,924.38/391.53
  6. Step 6: Final answer
    x = 347.16

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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.