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Finding the Fourth Proportional to 994.90, 1,493.44 and 790.78

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Solution

The fourth proportional to 994.90, 1,493.44 and 790.78 is: 1,187.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    994.90 : 1,493.44 = 790.78 : x
  2. Step 2: Convert to fraction form
    994.90/1,493.44 = 790.78/x
  3. Step 3: Cross multiply
    994.90x = 1,493.44 × 790.78
  4. Step 4: Simplify right side
    994.90x = 1,180,982.48
  5. Step 5: Solve for x
    x = 1,180,982.48/994.90
  6. Step 6: Final answer
    x = 1,187.04

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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.