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Finding the Fourth Proportional to 789.39, 1,089.33 and 440.07

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Solution

The fourth proportional to 789.39, 1,089.33 and 440.07 is: 607.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.39 : 1,089.33 = 440.07 : x
  2. Step 2: Convert to fraction form
    789.39/1,089.33 = 440.07/x
  3. Step 3: Cross multiply
    789.39x = 1,089.33 × 440.07
  4. Step 4: Simplify right side
    789.39x = 479,381.45
  5. Step 5: Solve for x
    x = 479,381.45/789.39
  6. Step 6: Final answer
    x = 607.28

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Double scale
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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.