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Finding the Fourth Proportional to 87,511.60, 131,235 and 68,828

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Solution

The fourth proportional to 87,511.60, 131,235 and 68,828 is: 103,216.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,511.60 : 131,235 = 68,828 : x
  2. Step 2: Convert to fraction form
    87,511.60/131,235 = 68,828/x
  3. Step 3: Cross multiply
    87,511.60x = 131,235 × 68,828
  4. Step 4: Simplify right side
    87,511.60x = 9,032,642,580
  5. Step 5: Solve for x
    x = 9,032,642,580/87,511.60
  6. Step 6: Final answer
    x = 103,216.52

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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.