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Finding the Fourth Proportional to 1,343.75, 1,854.38 and 878

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Solution

The fourth proportional to 1,343.75, 1,854.38 and 878 is: 1,211.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,343.75 : 1,854.38 = 878 : x
  2. Step 2: Convert to fraction form
    1,343.75/1,854.38 = 878/x
  3. Step 3: Cross multiply
    1,343.75x = 1,854.38 × 878
  4. Step 4: Simplify right side
    1,343.75x = 1,628,145.64
  5. Step 5: Solve for x
    x = 1,628,145.64/1,343.75
  6. Step 6: Final answer
    x = 1,211.64

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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.