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Finding the Fourth Proportional to 1,378.08, 2,066.31 and 683.91

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Solution

The fourth proportional to 1,378.08, 2,066.31 and 683.91 is: 1,025.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.08 : 2,066.31 = 683.91 : x
  2. Step 2: Convert to fraction form
    1,378.08/2,066.31 = 683.91/x
  3. Step 3: Cross multiply
    1,378.08x = 2,066.31 × 683.91
  4. Step 4: Simplify right side
    1,378.08x = 1,413,170.07
  5. Step 5: Solve for x
    x = 1,413,170.07/1,378.08
  6. Step 6: Final answer
    x = 1,025.46

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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.