Home / 20,425.05-30,643.50-7,278.45

Finding the Fourth Proportional to 20,425.05, 30,643.50 and 7,278.45

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Solution

The fourth proportional to 20,425.05, 30,643.50 and 7,278.45 is: 10,919.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,425.05 : 30,643.50 = 7,278.45 : x
  2. Step 2: Convert to fraction form
    20,425.05/30,643.50 = 7,278.45/x
  3. Step 3: Cross multiply
    20,425.05x = 30,643.50 × 7,278.45
  4. Step 4: Simplify right side
    20,425.05x = 223,037,182.58
  5. Step 5: Solve for x
    x = 223,037,182.58/20,425.05
  6. Step 6: Final answer
    x = 10,919.79

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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.