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Finding the Fourth Proportional to 260,978.18, 391,467.30 and 63,986.18

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Solution

The fourth proportional to 260,978.18, 391,467.30 and 63,986.18 is: 95,979.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,978.18 : 391,467.30 = 63,986.18 : x
  2. Step 2: Convert to fraction form
    260,978.18/391,467.30 = 63,986.18/x
  3. Step 3: Cross multiply
    260,978.18x = 391,467.30 × 63,986.18
  4. Step 4: Simplify right side
    260,978.18x = 25,048,497,121.91
  5. Step 5: Solve for x
    x = 25,048,497,121.91/260,978.18
  6. Step 6: Final answer
    x = 95,979.28

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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.