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Finding the Fourth Proportional to 2,918.78, 4,378.78 and 1,069.88

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Solution

The fourth proportional to 2,918.78, 4,378.78 and 1,069.88 is: 1,605.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,918.78 : 4,378.78 = 1,069.88 : x
  2. Step 2: Convert to fraction form
    2,918.78/4,378.78 = 1,069.88/x
  3. Step 3: Cross multiply
    2,918.78x = 4,378.78 × 1,069.88
  4. Step 4: Simplify right side
    2,918.78x = 4,684,769.15
  5. Step 5: Solve for x
    x = 4,684,769.15/2,918.78
  6. Step 6: Final answer
    x = 1,605.04

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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.