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Finding the Fourth Proportional to 931.42, 1,399.30 and 878.88

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Solution

The fourth proportional to 931.42, 1,399.30 and 878.88 is: 1,320.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.42 : 1,399.30 = 878.88 : x
  2. Step 2: Convert to fraction form
    931.42/1,399.30 = 878.88/x
  3. Step 3: Cross multiply
    931.42x = 1,399.30 × 878.88
  4. Step 4: Simplify right side
    931.42x = 1,229,815.48
  5. Step 5: Solve for x
    x = 1,229,815.48/931.42
  6. Step 6: Final answer
    x = 1,320.37

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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.