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Finding the Fourth Proportional to 1,425.73, 2,138.43 and 385.66

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Solution

The fourth proportional to 1,425.73, 2,138.43 and 385.66 is: 578.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.73 : 2,138.43 = 385.66 : x
  2. Step 2: Convert to fraction form
    1,425.73/2,138.43 = 385.66/x
  3. Step 3: Cross multiply
    1,425.73x = 2,138.43 × 385.66
  4. Step 4: Simplify right side
    1,425.73x = 824,706.91
  5. Step 5: Solve for x
    x = 824,706.91/1,425.73
  6. Step 6: Final answer
    x = 578.45

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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.