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Finding the Fourth Proportional to 667.17, 920.43 and 445.77

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Solution

The fourth proportional to 667.17, 920.43 and 445.77 is: 614.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.17 : 920.43 = 445.77 : x
  2. Step 2: Convert to fraction form
    667.17/920.43 = 445.77/x
  3. Step 3: Cross multiply
    667.17x = 920.43 × 445.77
  4. Step 4: Simplify right side
    667.17x = 410,300.08
  5. Step 5: Solve for x
    x = 410,300.08/667.17
  6. Step 6: Final answer
    x = 614.99

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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.