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Finding the Fourth Proportional to 667.19, 920.21 and 574.09

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Solution

The fourth proportional to 667.19, 920.21 and 574.09 is: 791.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.19 : 920.21 = 574.09 : x
  2. Step 2: Convert to fraction form
    667.19/920.21 = 574.09/x
  3. Step 3: Cross multiply
    667.19x = 920.21 × 574.09
  4. Step 4: Simplify right side
    667.19x = 528,281.42
  5. Step 5: Solve for x
    x = 528,281.42/667.19
  6. Step 6: Final answer
    x = 791.80

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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.