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Finding the Fourth Proportional to 1,207.10, 1,665.79 and 683.13

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Solution

The fourth proportional to 1,207.10, 1,665.79 and 683.13 is: 942.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.10 : 1,665.79 = 683.13 : x
  2. Step 2: Convert to fraction form
    1,207.10/1,665.79 = 683.13/x
  3. Step 3: Cross multiply
    1,207.10x = 1,665.79 × 683.13
  4. Step 4: Simplify right side
    1,207.10x = 1,137,951.12
  5. Step 5: Solve for x
    x = 1,137,951.12/1,207.10
  6. Step 6: Final answer
    x = 942.71

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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.