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Finding the Fourth Proportional to 20,460.80, 30,694.80 and 7,320.80

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Solution

The fourth proportional to 20,460.80, 30,694.80 and 7,320.80 is: 10,982.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,460.80 : 30,694.80 = 7,320.80 : x
  2. Step 2: Convert to fraction form
    20,460.80/30,694.80 = 7,320.80/x
  3. Step 3: Cross multiply
    20,460.80x = 30,694.80 × 7,320.80
  4. Step 4: Simplify right side
    20,460.80x = 224,710,491.84
  5. Step 5: Solve for x
    x = 224,710,491.84/20,460.80
  6. Step 6: Final answer
    x = 10,982.49

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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.