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Finding the Fourth Proportional to 667.95, 921.77 and 369.22

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Solution

The fourth proportional to 667.95, 921.77 and 369.22 is: 509.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.95 : 921.77 = 369.22 : x
  2. Step 2: Convert to fraction form
    667.95/921.77 = 369.22/x
  3. Step 3: Cross multiply
    667.95x = 921.77 × 369.22
  4. Step 4: Simplify right side
    667.95x = 340,331.77
  5. Step 5: Solve for x
    x = 340,331.77/667.95
  6. Step 6: Final answer
    x = 509.52

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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.