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Finding the Fourth Proportional to 683.93, 1,026.09 and 318.75

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Solution

The fourth proportional to 683.93, 1,026.09 and 318.75 is: 478.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.93 : 1,026.09 = 318.75 : x
  2. Step 2: Convert to fraction form
    683.93/1,026.09 = 318.75/x
  3. Step 3: Cross multiply
    683.93x = 1,026.09 × 318.75
  4. Step 4: Simplify right side
    683.93x = 327,066.19
  5. Step 5: Solve for x
    x = 327,066.19/683.93
  6. Step 6: Final answer
    x = 478.22

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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.