Home / 28,478.35-42,709.45-11,817.78

Finding the Fourth Proportional to 28,478.35, 42,709.45 and 11,817.78

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Solution

The fourth proportional to 28,478.35, 42,709.45 and 11,817.78 is: 17,723.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,478.35 : 42,709.45 = 11,817.78 : x
  2. Step 2: Convert to fraction form
    28,478.35/42,709.45 = 11,817.78/x
  3. Step 3: Cross multiply
    28,478.35x = 42,709.45 × 11,817.78
  4. Step 4: Simplify right side
    28,478.35x = 504,730,884.02
  5. Step 5: Solve for x
    x = 504,730,884.02/28,478.35
  6. Step 6: Final answer
    x = 17,723.32

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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.