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Finding the Fourth Proportional to 1,157.19, 1,733.94 and 939.69

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Solution

The fourth proportional to 1,157.19, 1,733.94 and 939.69 is: 1,408.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157.19 : 1,733.94 = 939.69 : x
  2. Step 2: Convert to fraction form
    1,157.19/1,733.94 = 939.69/x
  3. Step 3: Cross multiply
    1,157.19x = 1,733.94 × 939.69
  4. Step 4: Simplify right side
    1,157.19x = 1,629,366.08
  5. Step 5: Solve for x
    x = 1,629,366.08/1,157.19
  6. Step 6: Final answer
    x = 1,408.04

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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.