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Finding the Fourth Proportional to 1,086.38, 1,498.78 and 666.39

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Solution

The fourth proportional to 1,086.38, 1,498.78 and 666.39 is: 919.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.38 : 1,498.78 = 666.39 : x
  2. Step 2: Convert to fraction form
    1,086.38/1,498.78 = 666.39/x
  3. Step 3: Cross multiply
    1,086.38x = 1,498.78 × 666.39
  4. Step 4: Simplify right side
    1,086.38x = 998,772.00
  5. Step 5: Solve for x
    x = 998,772.00/1,086.38
  6. Step 6: Final answer
    x = 919.36

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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.