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Finding the Fourth Proportional to 931.40, 1,394.40 and 834.20

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Solution

The fourth proportional to 931.40, 1,394.40 and 834.20 is: 1,248.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.40 : 1,394.40 = 834.20 : x
  2. Step 2: Convert to fraction form
    931.40/1,394.40 = 834.20/x
  3. Step 3: Cross multiply
    931.40x = 1,394.40 × 834.20
  4. Step 4: Simplify right side
    931.40x = 1,163,208.48
  5. Step 5: Solve for x
    x = 1,163,208.48/931.40
  6. Step 6: Final answer
    x = 1,248.88

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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.