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Finding the Fourth Proportional to 1,425.78, 1,966.41 and 1,418.49

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Solution

The fourth proportional to 1,425.78, 1,966.41 and 1,418.49 is: 1,956.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.78 : 1,966.41 = 1,418.49 : x
  2. Step 2: Convert to fraction form
    1,425.78/1,966.41 = 1,418.49/x
  3. Step 3: Cross multiply
    1,425.78x = 1,966.41 × 1,418.49
  4. Step 4: Simplify right side
    1,425.78x = 2,789,332.92
  5. Step 5: Solve for x
    x = 2,789,332.92/1,425.78
  6. Step 6: Final answer
    x = 1,956.36

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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.