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Finding the Fourth Proportional to 1,157, 1,734.46 and 426.42

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Solution

The fourth proportional to 1,157, 1,734.46 and 426.42 is: 639.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157 : 1,734.46 = 426.42 : x
  2. Step 2: Convert to fraction form
    1,157/1,734.46 = 426.42/x
  3. Step 3: Cross multiply
    1,157x = 1,734.46 × 426.42
  4. Step 4: Simplify right side
    1,157x = 739,608.43
  5. Step 5: Solve for x
    x = 739,608.43/1,157
  6. Step 6: Final answer
    x = 639.25

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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.