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Finding the Fourth Proportional to 1,199.12, 1,654.75 and 667.99

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Solution

The fourth proportional to 1,199.12, 1,654.75 and 667.99 is: 921.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.12 : 1,654.75 = 667.99 : x
  2. Step 2: Convert to fraction form
    1,199.12/1,654.75 = 667.99/x
  3. Step 3: Cross multiply
    1,199.12x = 1,654.75 × 667.99
  4. Step 4: Simplify right side
    1,199.12x = 1,105,344.84
  5. Step 5: Solve for x
    x = 1,105,344.84/1,199.12
  6. Step 6: Final answer
    x = 921.80

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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.