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Finding the Fourth Proportional to 1,356.78, 2,033.70 and 663.92

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Solution

The fourth proportional to 1,356.78, 2,033.70 and 663.92 is: 995.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.78 : 2,033.70 = 663.92 : x
  2. Step 2: Convert to fraction form
    1,356.78/2,033.70 = 663.92/x
  3. Step 3: Cross multiply
    1,356.78x = 2,033.70 × 663.92
  4. Step 4: Simplify right side
    1,356.78x = 1,350,203.94
  5. Step 5: Solve for x
    x = 1,350,203.94/1,356.78
  6. Step 6: Final answer
    x = 995.15

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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.