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Finding the Fourth Proportional to 668.62, 922.56 and 419.86

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Solution

The fourth proportional to 668.62, 922.56 and 419.86 is: 579.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.62 : 922.56 = 419.86 : x
  2. Step 2: Convert to fraction form
    668.62/922.56 = 419.86/x
  3. Step 3: Cross multiply
    668.62x = 922.56 × 419.86
  4. Step 4: Simplify right side
    668.62x = 387,346.04
  5. Step 5: Solve for x
    x = 387,346.04/668.62
  6. Step 6: Final answer
    x = 579.32

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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.