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Finding the Fourth Proportional to 391,308.89, 540,449.75 and 263,765.21

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Solution

The fourth proportional to 391,308.89, 540,449.75 and 263,765.21 is: 364,294.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,308.89 : 540,449.75 = 263,765.21 : x
  2. Step 2: Convert to fraction form
    391,308.89/540,449.75 = 263,765.21/x
  3. Step 3: Cross multiply
    391,308.89x = 540,449.75 × 263,765.21
  4. Step 4: Simplify right side
    391,308.89x = 142,551,839,760.36
  5. Step 5: Solve for x
    x = 142,551,839,760.36/391,308.89
  6. Step 6: Final answer
    x = 364,294.92

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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.