Home / 81,011.92-121,434.48-31,078.72

Finding the Fourth Proportional to 81,011.92, 121,434.48 and 31,078.72

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Solution

The fourth proportional to 81,011.92, 121,434.48 and 31,078.72 is: 46,586.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,011.92 : 121,434.48 = 31,078.72 : x
  2. Step 2: Convert to fraction form
    81,011.92/121,434.48 = 31,078.72/x
  3. Step 3: Cross multiply
    81,011.92x = 121,434.48 × 31,078.72
  4. Step 4: Simplify right side
    81,011.92x = 3,774,028,202.27
  5. Step 5: Solve for x
    x = 3,774,028,202.27/81,011.92
  6. Step 6: Final answer
    x = 46,586.09

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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.