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Finding the Fourth Proportional to 789.42, 1,089.39 and 435.34

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Solution

The fourth proportional to 789.42, 1,089.39 and 435.34 is: 600.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.42 : 1,089.39 = 435.34 : x
  2. Step 2: Convert to fraction form
    789.42/1,089.39 = 435.34/x
  3. Step 3: Cross multiply
    789.42x = 1,089.39 × 435.34
  4. Step 4: Simplify right side
    789.42x = 474,255.04
  5. Step 5: Solve for x
    x = 474,255.04/789.42
  6. Step 6: Final answer
    x = 600.76

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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.