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Finding the Fourth Proportional to 660,515.31, 991,101.02 and 261,442.49

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Solution

The fourth proportional to 660,515.31, 991,101.02 and 261,442.49 is: 392,293.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,515.31 : 991,101.02 = 261,442.49 : x
  2. Step 2: Convert to fraction form
    660,515.31/991,101.02 = 261,442.49/x
  3. Step 3: Cross multiply
    660,515.31x = 991,101.02 × 261,442.49
  4. Step 4: Simplify right side
    660,515.31x = 259,115,912,247.62
  5. Step 5: Solve for x
    x = 259,115,912,247.62/660,515.31
  6. Step 6: Final answer
    x = 392,293.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.