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Finding the Fourth Proportional to 1,393.66, 1,917.57 and 1,206.55

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Solution

The fourth proportional to 1,393.66, 1,917.57 and 1,206.55 is: 1,660.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.66 : 1,917.57 = 1,206.55 : x
  2. Step 2: Convert to fraction form
    1,393.66/1,917.57 = 1,206.55/x
  3. Step 3: Cross multiply
    1,393.66x = 1,917.57 × 1,206.55
  4. Step 4: Simplify right side
    1,393.66x = 2,313,644.08
  5. Step 5: Solve for x
    x = 2,313,644.08/1,393.66
  6. Step 6: Final answer
    x = 1,660.12

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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.