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Finding the Fourth Proportional to 666.68, 921.11 and 501.44

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Solution

The fourth proportional to 666.68, 921.11 and 501.44 is: 692.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.68 : 921.11 = 501.44 : x
  2. Step 2: Convert to fraction form
    666.68/921.11 = 501.44/x
  3. Step 3: Cross multiply
    666.68x = 921.11 × 501.44
  4. Step 4: Simplify right side
    666.68x = 461,874.29
  5. Step 5: Solve for x
    x = 461,874.29/666.68
  6. Step 6: Final answer
    x = 692.80

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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.