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Finding the Fourth Proportional to 667.71, 921.44 and 368.96

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Solution

The fourth proportional to 667.71, 921.44 and 368.96 is: 509.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.71 : 921.44 = 368.96 : x
  2. Step 2: Convert to fraction form
    667.71/921.44 = 368.96/x
  3. Step 3: Cross multiply
    667.71x = 921.44 × 368.96
  4. Step 4: Simplify right side
    667.71x = 339,974.50
  5. Step 5: Solve for x
    x = 339,974.50/667.71
  6. Step 6: Final answer
    x = 509.16

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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.