Home / 81,438.18-122,127.32-28,116.62

Finding the Fourth Proportional to 81,438.18, 122,127.32 and 28,116.62

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Solution

The fourth proportional to 81,438.18, 122,127.32 and 28,116.62 is: 42,164.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,438.18 : 122,127.32 = 28,116.62 : x
  2. Step 2: Convert to fraction form
    81,438.18/122,127.32 = 28,116.62/x
  3. Step 3: Cross multiply
    81,438.18x = 122,127.32 × 28,116.62
  4. Step 4: Simplify right side
    81,438.18x = 3,433,807,286.61
  5. Step 5: Solve for x
    x = 3,433,807,286.61/81,438.18
  6. Step 6: Final answer
    x = 42,164.59

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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.