Home / 81,013.50-121,515.09-30,402.54

Finding the Fourth Proportional to 81,013.50, 121,515.09 and 30,402.54

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Solution

The fourth proportional to 81,013.50, 121,515.09 and 30,402.54 is: 45,601.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,013.50 : 121,515.09 = 30,402.54 : x
  2. Step 2: Convert to fraction form
    81,013.50/121,515.09 = 30,402.54/x
  3. Step 3: Cross multiply
    81,013.50x = 121,515.09 × 30,402.54
  4. Step 4: Simplify right side
    81,013.50x = 3,694,367,384.33
  5. Step 5: Solve for x
    x = 3,694,367,384.33/81,013.50
  6. Step 6: Final answer
    x = 45,601.87

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1.5x scale

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.