Home / 20,378.79-30,575.88-10,511.78

Finding the Fourth Proportional to 20,378.79, 30,575.88 and 10,511.78

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Solution

The fourth proportional to 20,378.79, 30,575.88 and 10,511.78 is: 15,771.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.79 : 30,575.88 = 10,511.78 : x
  2. Step 2: Convert to fraction form
    20,378.79/30,575.88 = 10,511.78/x
  3. Step 3: Cross multiply
    20,378.79x = 30,575.88 × 10,511.78
  4. Step 4: Simplify right side
    20,378.79x = 321,406,770.99
  5. Step 5: Solve for x
    x = 321,406,770.99/20,378.79
  6. Step 6: Final answer
    x = 15,771.63

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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.