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Finding the Fourth Proportional to 45,782.40, 68,716.80 and 28,286.40

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Solution

The fourth proportional to 45,782.40, 68,716.80 and 28,286.40 is: 42,456.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,782.40 : 68,716.80 = 28,286.40 : x
  2. Step 2: Convert to fraction form
    45,782.40/68,716.80 = 28,286.40/x
  3. Step 3: Cross multiply
    45,782.40x = 68,716.80 × 28,286.40
  4. Step 4: Simplify right side
    45,782.40x = 1,943,750,891.52
  5. Step 5: Solve for x
    x = 1,943,750,891.52/45,782.40
  6. Step 6: Final answer
    x = 42,456.29

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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.