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Finding the Fourth Proportional to 391.89, 540.58 and 259.12

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Solution

The fourth proportional to 391.89, 540.58 and 259.12 is: 357.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.89 : 540.58 = 259.12 : x
  2. Step 2: Convert to fraction form
    391.89/540.58 = 259.12/x
  3. Step 3: Cross multiply
    391.89x = 540.58 × 259.12
  4. Step 4: Simplify right side
    391.89x = 140,075.09
  5. Step 5: Solve for x
    x = 140,075.09/391.89
  6. Step 6: Final answer
    x = 357.43

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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.