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Finding the Fourth Proportional to 912.20, 1,367.01 and 705.81

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Solution

The fourth proportional to 912.20, 1,367.01 and 705.81 is: 1,057.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    912.20 : 1,367.01 = 705.81 : x
  2. Step 2: Convert to fraction form
    912.20/1,367.01 = 705.81/x
  3. Step 3: Cross multiply
    912.20x = 1,367.01 × 705.81
  4. Step 4: Simplify right side
    912.20x = 964,854.45
  5. Step 5: Solve for x
    x = 964,854.45/912.20
  6. Step 6: Final answer
    x = 1,057.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.