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Finding the Fourth Proportional to 1,317.15, 1,975.73 and 667.44

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Solution

The fourth proportional to 1,317.15, 1,975.73 and 667.44 is: 1,001.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.15 : 1,975.73 = 667.44 : x
  2. Step 2: Convert to fraction form
    1,317.15/1,975.73 = 667.44/x
  3. Step 3: Cross multiply
    1,317.15x = 1,975.73 × 667.44
  4. Step 4: Simplify right side
    1,317.15x = 1,318,677.89
  5. Step 5: Solve for x
    x = 1,318,677.89/1,317.15
  6. Step 6: Final answer
    x = 1,001.16

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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.