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Finding the Fourth Proportional to 1,118.97, 1,678.70 and 338.96

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Solution

The fourth proportional to 1,118.97, 1,678.70 and 338.96 is: 508.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118.97 : 1,678.70 = 338.96 : x
  2. Step 2: Convert to fraction form
    1,118.97/1,678.70 = 338.96/x
  3. Step 3: Cross multiply
    1,118.97x = 1,678.70 × 338.96
  4. Step 4: Simplify right side
    1,118.97x = 569,002.06
  5. Step 5: Solve for x
    x = 569,002.06/1,118.97
  6. Step 6: Final answer
    x = 508.51

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Double scale
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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.