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Finding the Fourth Proportional to 1,540.42, 2,125.84 and 841.78

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Solution

The fourth proportional to 1,540.42, 2,125.84 and 841.78 is: 1,161.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,540.42 : 2,125.84 = 841.78 : x
  2. Step 2: Convert to fraction form
    1,540.42/2,125.84 = 841.78/x
  3. Step 3: Cross multiply
    1,540.42x = 2,125.84 × 841.78
  4. Step 4: Simplify right side
    1,540.42x = 1,789,489.60
  5. Step 5: Solve for x
    x = 1,789,489.60/1,540.42
  6. Step 6: Final answer
    x = 1,161.69

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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.