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Finding the Fourth Proportional to 18,944.80, 28,417.20 and 9,728.80

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Solution

The fourth proportional to 18,944.80, 28,417.20 and 9,728.80 is: 14,593.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,944.80 : 28,417.20 = 9,728.80 : x
  2. Step 2: Convert to fraction form
    18,944.80/28,417.20 = 9,728.80/x
  3. Step 3: Cross multiply
    18,944.80x = 28,417.20 × 9,728.80
  4. Step 4: Simplify right side
    18,944.80x = 276,465,255.36
  5. Step 5: Solve for x
    x = 276,465,255.36/18,944.80
  6. Step 6: Final answer
    x = 14,593.20

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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.