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Finding the Fourth Proportional to 1,425.43, 2,138.50 and 840.92

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Solution

The fourth proportional to 1,425.43, 2,138.50 and 840.92 is: 1,261.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.43 : 2,138.50 = 840.92 : x
  2. Step 2: Convert to fraction form
    1,425.43/2,138.50 = 840.92/x
  3. Step 3: Cross multiply
    1,425.43x = 2,138.50 × 840.92
  4. Step 4: Simplify right side
    1,425.43x = 1,798,297.78
  5. Step 5: Solve for x
    x = 1,798,297.78/1,425.43
  6. Step 6: Final answer
    x = 1,261.58

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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.