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Finding the Fourth Proportional to 667.85, 920.77 and 419.07

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Solution

The fourth proportional to 667.85, 920.77 and 419.07 is: 577.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.85 : 920.77 = 419.07 : x
  2. Step 2: Convert to fraction form
    667.85/920.77 = 419.07/x
  3. Step 3: Cross multiply
    667.85x = 920.77 × 419.07
  4. Step 4: Simplify right side
    667.85x = 385,869.49
  5. Step 5: Solve for x
    x = 385,869.49/667.85
  6. Step 6: Final answer
    x = 577.78

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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.