Home / 20,528.12-30,778.51-7,378.78

Finding the Fourth Proportional to 20,528.12, 30,778.51 and 7,378.78

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Solution

The fourth proportional to 20,528.12, 30,778.51 and 7,378.78 is: 11,063.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,528.12 : 30,778.51 = 7,378.78 : x
  2. Step 2: Convert to fraction form
    20,528.12/30,778.51 = 7,378.78/x
  3. Step 3: Cross multiply
    20,528.12x = 30,778.51 × 7,378.78
  4. Step 4: Simplify right side
    20,528.12x = 227,107,895.98
  5. Step 5: Solve for x
    x = 227,107,895.98/20,528.12
  6. Step 6: Final answer
    x = 11,063.26

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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.