Home / 81,787.98-122,609.18-31,856.42

Finding the Fourth Proportional to 81,787.98, 122,609.18 and 31,856.42

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Solution

The fourth proportional to 81,787.98, 122,609.18 and 31,856.42 is: 47,756.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,787.98 : 122,609.18 = 31,856.42 : x
  2. Step 2: Convert to fraction form
    81,787.98/122,609.18 = 31,856.42/x
  3. Step 3: Cross multiply
    81,787.98x = 122,609.18 × 31,856.42
  4. Step 4: Simplify right side
    81,787.98x = 3,905,889,533.94
  5. Step 5: Solve for x
    x = 3,905,889,533.94/81,787.98
  6. Step 6: Final answer
    x = 47,756.28

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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.