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Finding the Fourth Proportional to 667.17, 920.34 and 418.37

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Solution

The fourth proportional to 667.17, 920.34 and 418.37 is: 577.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.17 : 920.34 = 418.37 : x
  2. Step 2: Convert to fraction form
    667.17/920.34 = 418.37/x
  3. Step 3: Cross multiply
    667.17x = 920.34 × 418.37
  4. Step 4: Simplify right side
    667.17x = 385,038.04
  5. Step 5: Solve for x
    x = 385,038.04/667.17
  6. Step 6: Final answer
    x = 577.12

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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.