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Finding the Fourth Proportional to 668.60, 921.81 and 458.41

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Solution

The fourth proportional to 668.60, 921.81 and 458.41 is: 632.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.60 : 921.81 = 458.41 : x
  2. Step 2: Convert to fraction form
    668.60/921.81 = 458.41/x
  3. Step 3: Cross multiply
    668.60x = 921.81 × 458.41
  4. Step 4: Simplify right side
    668.60x = 422,564.62
  5. Step 5: Solve for x
    x = 422,564.62/668.60
  6. Step 6: Final answer
    x = 632.01

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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.