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Finding the Fourth Proportional to 789.98, 1,090.20 and 691.56

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Solution

The fourth proportional to 789.98, 1,090.20 and 691.56 is: 954.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.98 : 1,090.20 = 691.56 : x
  2. Step 2: Convert to fraction form
    789.98/1,090.20 = 691.56/x
  3. Step 3: Cross multiply
    789.98x = 1,090.20 × 691.56
  4. Step 4: Simplify right side
    789.98x = 753,938.71
  5. Step 5: Solve for x
    x = 753,938.71/789.98
  6. Step 6: Final answer
    x = 954.38

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1.5x scale

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.