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Finding the Fourth Proportional to 667.15, 920.66 and 368.39

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Solution

The fourth proportional to 667.15, 920.66 and 368.39 is: 508.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.15 : 920.66 = 368.39 : x
  2. Step 2: Convert to fraction form
    667.15/920.66 = 368.39/x
  3. Step 3: Cross multiply
    667.15x = 920.66 × 368.39
  4. Step 4: Simplify right side
    667.15x = 339,165.16
  5. Step 5: Solve for x
    x = 339,165.16/667.15
  6. Step 6: Final answer
    x = 508.38

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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.