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Finding the Fourth Proportional to 990.66, 1,366.97 and 548.55

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Solution

The fourth proportional to 990.66, 1,366.97 and 548.55 is: 756.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.66 : 1,366.97 = 548.55 : x
  2. Step 2: Convert to fraction form
    990.66/1,366.97 = 548.55/x
  3. Step 3: Cross multiply
    990.66x = 1,366.97 × 548.55
  4. Step 4: Simplify right side
    990.66x = 749,851.39
  5. Step 5: Solve for x
    x = 749,851.39/990.66
  6. Step 6: Final answer
    x = 756.92

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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.