Home / 20,631.94-30,928.79-7,480.78

Finding the Fourth Proportional to 20,631.94, 30,928.79 and 7,480.78

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Solution

The fourth proportional to 20,631.94, 30,928.79 and 7,480.78 is: 11,214.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,631.94 : 30,928.79 = 7,480.78 : x
  2. Step 2: Convert to fraction form
    20,631.94/30,928.79 = 7,480.78/x
  3. Step 3: Cross multiply
    20,631.94x = 30,928.79 × 7,480.78
  4. Step 4: Simplify right side
    20,631.94x = 231,371,337.71
  5. Step 5: Solve for x
    x = 231,371,337.71/20,631.94
  6. Step 6: Final answer
    x = 11,214.23

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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.