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Finding the Fourth Proportional to 990.55, 1,366.98 and 548.48

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Solution

The fourth proportional to 990.55, 1,366.98 and 548.48 is: 756.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.55 : 1,366.98 = 548.48 : x
  2. Step 2: Convert to fraction form
    990.55/1,366.98 = 548.48/x
  3. Step 3: Cross multiply
    990.55x = 1,366.98 × 548.48
  4. Step 4: Simplify right side
    990.55x = 749,765.64
  5. Step 5: Solve for x
    x = 749,765.64/990.55
  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.