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Finding the Fourth Proportional to 86,991.31, 120,020.55 and 48,745.54

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Solution

The fourth proportional to 86,991.31, 120,020.55 and 48,745.54 is: 67,253.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,991.31 : 120,020.55 = 48,745.54 : x
  2. Step 2: Convert to fraction form
    86,991.31/120,020.55 = 48,745.54/x
  3. Step 3: Cross multiply
    86,991.31x = 120,020.55 × 48,745.54
  4. Step 4: Simplify right side
    86,991.31x = 5,850,465,920.74
  5. Step 5: Solve for x
    x = 5,850,465,920.74/86,991.31
  6. Step 6: Final answer
    x = 67,253.46

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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.