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Finding the Fourth Proportional to 789.50, 1,089.51 and 440.21

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Solution

The fourth proportional to 789.50, 1,089.51 and 440.21 is: 607.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.50 : 1,089.51 = 440.21 : x
  2. Step 2: Convert to fraction form
    789.50/1,089.51 = 440.21/x
  3. Step 3: Cross multiply
    789.50x = 1,089.51 × 440.21
  4. Step 4: Simplify right side
    789.50x = 479,613.20
  5. Step 5: Solve for x
    x = 479,613.20/789.50
  6. Step 6: Final answer
    x = 607.49

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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.