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Finding the Fourth Proportional to 669.27, 1,007.62 and 611.87

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Solution

The fourth proportional to 669.27, 1,007.62 and 611.87 is: 921.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.27 : 1,007.62 = 611.87 : x
  2. Step 2: Convert to fraction form
    669.27/1,007.62 = 611.87/x
  3. Step 3: Cross multiply
    669.27x = 1,007.62 × 611.87
  4. Step 4: Simplify right side
    669.27x = 616,525.88
  5. Step 5: Solve for x
    x = 616,525.88/669.27
  6. Step 6: Final answer
    x = 921.19

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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.