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Finding the Fourth Proportional to 5,318.65, 7,978.17 and 2,718.55

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Solution

The fourth proportional to 5,318.65, 7,978.17 and 2,718.55 is: 4,077.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,318.65 : 7,978.17 = 2,718.55 : x
  2. Step 2: Convert to fraction form
    5,318.65/7,978.17 = 2,718.55/x
  3. Step 3: Cross multiply
    5,318.65x = 7,978.17 × 2,718.55
  4. Step 4: Simplify right side
    5,318.65x = 21,689,054.05
  5. Step 5: Solve for x
    x = 21,689,054.05/5,318.65
  6. Step 6: Final answer
    x = 4,077.92

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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.