Home / 20,320.85-30,490.86-7,179.41

Finding the Fourth Proportional to 20,320.85, 30,490.86 and 7,179.41

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Solution

The fourth proportional to 20,320.85, 30,490.86 and 7,179.41 is: 10,772.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,320.85 : 30,490.86 = 7,179.41 : x
  2. Step 2: Convert to fraction form
    20,320.85/30,490.86 = 7,179.41/x
  3. Step 3: Cross multiply
    20,320.85x = 30,490.86 × 7,179.41
  4. Step 4: Simplify right side
    20,320.85x = 218,906,385.19
  5. Step 5: Solve for x
    x = 218,906,385.19/20,320.85
  6. Step 6: Final answer
    x = 10,772.50

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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.