Home / 20,921.40-31,382.35-6,130.61

Finding the Fourth Proportional to 20,921.40, 31,382.35 and 6,130.61

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Solution

The fourth proportional to 20,921.40, 31,382.35 and 6,130.61 is: 9,195.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.40 : 31,382.35 = 6,130.61 : x
  2. Step 2: Convert to fraction form
    20,921.40/31,382.35 = 6,130.61/x
  3. Step 3: Cross multiply
    20,921.40x = 31,382.35 × 6,130.61
  4. Step 4: Simplify right side
    20,921.40x = 192,392,948.73
  5. Step 5: Solve for x
    x = 192,392,948.73/20,921.40
  6. Step 6: Final answer
    x = 9,195.99

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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.