Home / 81,212.48-121,864.80-31,999.04

Finding the Fourth Proportional to 81,212.48, 121,864.80 and 31,999.04

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Solution

The fourth proportional to 81,212.48, 121,864.80 and 31,999.04 is: 48,016.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,212.48 : 121,864.80 = 31,999.04 : x
  2. Step 2: Convert to fraction form
    81,212.48/121,864.80 = 31,999.04/x
  3. Step 3: Cross multiply
    81,212.48x = 121,864.80 × 31,999.04
  4. Step 4: Simplify right side
    81,212.48x = 3,899,556,609.79
  5. Step 5: Solve for x
    x = 3,899,556,609.79/81,212.48
  6. Step 6: Final answer
    x = 48,016.72

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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.