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Finding the Fourth Proportional to 68,172.85, 94,016.32 and 42,978.61

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Solution

The fourth proportional to 68,172.85, 94,016.32 and 42,978.61 is: 59,271.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,172.85 : 94,016.32 = 42,978.61 : x
  2. Step 2: Convert to fraction form
    68,172.85/94,016.32 = 42,978.61/x
  3. Step 3: Cross multiply
    68,172.85x = 94,016.32 × 42,978.61
  4. Step 4: Simplify right side
    68,172.85x = 4,040,690,750.92
  5. Step 5: Solve for x
    x = 4,040,690,750.92/68,172.85
  6. Step 6: Final answer
    x = 59,271.26

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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.