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Finding the Fourth Proportional to 669.02, 921.66 and 636.08

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Solution

The fourth proportional to 669.02, 921.66 and 636.08 is: 876.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.02 : 921.66 = 636.08 : x
  2. Step 2: Convert to fraction form
    669.02/921.66 = 636.08/x
  3. Step 3: Cross multiply
    669.02x = 921.66 × 636.08
  4. Step 4: Simplify right side
    669.02x = 586,249.49
  5. Step 5: Solve for x
    x = 586,249.49/669.02
  6. Step 6: Final answer
    x = 876.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.