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Finding the Fourth Proportional to 1,199.45, 1,655.14 and 668.31

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Solution

The fourth proportional to 1,199.45, 1,655.14 and 668.31 is: 922.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,199.45 : 1,655.14 = 668.31 : x
  2. Step 2: Convert to fraction form
    1,199.45/1,655.14 = 668.31/x
  3. Step 3: Cross multiply
    1,199.45x = 1,655.14 × 668.31
  4. Step 4: Simplify right side
    1,199.45x = 1,106,146.61
  5. Step 5: Solve for x
    x = 1,106,146.61/1,199.45
  6. Step 6: Final answer
    x = 922.21

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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.