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Finding the Fourth Proportional to 28,245.40, 42,416.70 and 19,983.40

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Solution

The fourth proportional to 28,245.40, 42,416.70 and 19,983.40 is: 30,009.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,245.40 : 42,416.70 = 19,983.40 : x
  2. Step 2: Convert to fraction form
    28,245.40/42,416.70 = 19,983.40/x
  3. Step 3: Cross multiply
    28,245.40x = 42,416.70 × 19,983.40
  4. Step 4: Simplify right side
    28,245.40x = 847,629,882.78
  5. Step 5: Solve for x
    x = 847,629,882.78/28,245.40
  6. Step 6: Final answer
    x = 30,009.48

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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.