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Finding the Fourth Proportional to 2,111.76, 3,167.64 and 878.40

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Solution

The fourth proportional to 2,111.76, 3,167.64 and 878.40 is: 1,317.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,111.76 : 3,167.64 = 878.40 : x
  2. Step 2: Convert to fraction form
    2,111.76/3,167.64 = 878.40/x
  3. Step 3: Cross multiply
    2,111.76x = 3,167.64 × 878.40
  4. Step 4: Simplify right side
    2,111.76x = 2,782,454.98
  5. Step 5: Solve for x
    x = 2,782,454.98/2,111.76
  6. Step 6: Final answer
    x = 1,317.60

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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.