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Finding the Fourth Proportional to 668.13, 922.20 and 419.58

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Solution

The fourth proportional to 668.13, 922.20 and 419.58 is: 579.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.13 : 922.20 = 419.58 : x
  2. Step 2: Convert to fraction form
    668.13/922.20 = 419.58/x
  3. Step 3: Cross multiply
    668.13x = 922.20 × 419.58
  4. Step 4: Simplify right side
    668.13x = 386,936.68
  5. Step 5: Solve for x
    x = 386,936.68/668.13
  6. Step 6: Final answer
    x = 579.13

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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.