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Finding the Fourth Proportional to 1,097.78, 1,515.11 and 878.40

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Solution

The fourth proportional to 1,097.78, 1,515.11 and 878.40 is: 1,212.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,097.78 : 1,515.11 = 878.40 : x
  2. Step 2: Convert to fraction form
    1,097.78/1,515.11 = 878.40/x
  3. Step 3: Cross multiply
    1,097.78x = 1,515.11 × 878.40
  4. Step 4: Simplify right side
    1,097.78x = 1,330,868.23
  5. Step 5: Solve for x
    x = 1,330,868.23/1,097.78
  6. Step 6: Final answer
    x = 1,212.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.