Home / 81,905.12-122,809.20-31,926.87

Finding the Fourth Proportional to 81,905.12, 122,809.20 and 31,926.87

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Solution

The fourth proportional to 81,905.12, 122,809.20 and 31,926.87 is: 47,871.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,905.12 : 122,809.20 = 31,926.87 : x
  2. Step 2: Convert to fraction form
    81,905.12/122,809.20 = 31,926.87/x
  3. Step 3: Cross multiply
    81,905.12x = 122,809.20 × 31,926.87
  4. Step 4: Simplify right side
    81,905.12x = 3,920,913,363.20
  5. Step 5: Solve for x
    x = 3,920,913,363.20/81,905.12
  6. Step 6: Final answer
    x = 47,871.41

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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.