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Finding the Fourth Proportional to 5,318.40, 7,981.20 and 2,395.20

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Solution

The fourth proportional to 5,318.40, 7,981.20 and 2,395.20 is: 3,594.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,318.40 : 7,981.20 = 2,395.20 : x
  2. Step 2: Convert to fraction form
    5,318.40/7,981.20 = 2,395.20/x
  3. Step 3: Cross multiply
    5,318.40x = 7,981.20 × 2,395.20
  4. Step 4: Simplify right side
    5,318.40x = 19,116,570.24
  5. Step 5: Solve for x
    x = 19,116,570.24/5,318.40
  6. Step 6: Final answer
    x = 3,594.42

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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.