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Finding the Fourth Proportional to 1,405.32, 1,939.35 and 845.81

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Solution

The fourth proportional to 1,405.32, 1,939.35 and 845.81 is: 1,167.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.32 : 1,939.35 = 845.81 : x
  2. Step 2: Convert to fraction form
    1,405.32/1,939.35 = 845.81/x
  3. Step 3: Cross multiply
    1,405.32x = 1,939.35 × 845.81
  4. Step 4: Simplify right side
    1,405.32x = 1,640,311.93
  5. Step 5: Solve for x
    x = 1,640,311.93/1,405.32
  6. Step 6: Final answer
    x = 1,167.22

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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.