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Finding the Fourth Proportional to 789.55, 1,089.58 and 440.26

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Solution

The fourth proportional to 789.55, 1,089.58 and 440.26 is: 607.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.55 : 1,089.58 = 440.26 : x
  2. Step 2: Convert to fraction form
    789.55/1,089.58 = 440.26/x
  3. Step 3: Cross multiply
    789.55x = 1,089.58 × 440.26
  4. Step 4: Simplify right side
    789.55x = 479,691.94
  5. Step 5: Solve for x
    x = 479,691.94/789.55
  6. Step 6: Final answer
    x = 607.55

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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.