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Finding the Fourth Proportional to 3,321.36, 4,981.28 and 981.40

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Solution

The fourth proportional to 3,321.36, 4,981.28 and 981.40 is: 1,471.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.36 : 4,981.28 = 981.40 : x
  2. Step 2: Convert to fraction form
    3,321.36/4,981.28 = 981.40/x
  3. Step 3: Cross multiply
    3,321.36x = 4,981.28 × 981.40
  4. Step 4: Simplify right side
    3,321.36x = 4,888,628.19
  5. Step 5: Solve for x
    x = 4,888,628.19/3,321.36
  6. Step 6: Final answer
    x = 1,471.88

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.