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Finding the Fourth Proportional to 86,408.67, 119,259.24 and 68,639.31

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Solution

The fourth proportional to 86,408.67, 119,259.24 and 68,639.31 is: 94,734.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,408.67 : 119,259.24 = 68,639.31 : x
  2. Step 2: Convert to fraction form
    86,408.67/119,259.24 = 68,639.31/x
  3. Step 3: Cross multiply
    86,408.67x = 119,259.24 × 68,639.31
  4. Step 4: Simplify right side
    86,408.67x = 8,185,871,944.72
  5. Step 5: Solve for x
    x = 8,185,871,944.72/86,408.67
  6. Step 6: Final answer
    x = 94,734.38

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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.