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Finding the Fourth Proportional to 666.72, 1,004.04 and 605.28

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Solution

The fourth proportional to 666.72, 1,004.04 and 605.28 is: 911.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.72 : 1,004.04 = 605.28 : x
  2. Step 2: Convert to fraction form
    666.72/1,004.04 = 605.28/x
  3. Step 3: Cross multiply
    666.72x = 1,004.04 × 605.28
  4. Step 4: Simplify right side
    666.72x = 607,725.33
  5. Step 5: Solve for x
    x = 607,725.33/666.72
  6. Step 6: Final answer
    x = 911.52

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.