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Finding the Fourth Proportional to 1,115.74, 1,667.75 and 968.32

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Solution

The fourth proportional to 1,115.74, 1,667.75 and 968.32 is: 1,447.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.74 : 1,667.75 = 968.32 : x
  2. Step 2: Convert to fraction form
    1,115.74/1,667.75 = 968.32/x
  3. Step 3: Cross multiply
    1,115.74x = 1,667.75 × 968.32
  4. Step 4: Simplify right side
    1,115.74x = 1,614,915.68
  5. Step 5: Solve for x
    x = 1,614,915.68/1,115.74
  6. Step 6: Final answer
    x = 1,447.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.