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Finding the Fourth Proportional to 891.40, 1,334.40 and 794.20

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Solution

The fourth proportional to 891.40, 1,334.40 and 794.20 is: 1,188.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.40 : 1,334.40 = 794.20 : x
  2. Step 2: Convert to fraction form
    891.40/1,334.40 = 794.20/x
  3. Step 3: Cross multiply
    891.40x = 1,334.40 × 794.20
  4. Step 4: Simplify right side
    891.40x = 1,059,780.48
  5. Step 5: Solve for x
    x = 1,059,780.48/891.40
  6. Step 6: Final answer
    x = 1,188.89

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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.