Home / 81,207.27-121,778.64-31,259.70

Finding the Fourth Proportional to 81,207.27, 121,778.64 and 31,259.70

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Solution

The fourth proportional to 81,207.27, 121,778.64 and 31,259.70 is: 46,877.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,207.27 : 121,778.64 = 31,259.70 : x
  2. Step 2: Convert to fraction form
    81,207.27/121,778.64 = 31,259.70/x
  3. Step 3: Cross multiply
    81,207.27x = 121,778.64 × 31,259.70
  4. Step 4: Simplify right side
    81,207.27x = 3,806,763,752.81
  5. Step 5: Solve for x
    x = 3,806,763,752.81/81,207.27
  6. Step 6: Final answer
    x = 46,877.13

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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.