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Finding the Fourth Proportional to 990.53, 1,366.78 and 548.45

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Solution

The fourth proportional to 990.53, 1,366.78 and 548.45 is: 756.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.53 : 1,366.78 = 548.45 : x
  2. Step 2: Convert to fraction form
    990.53/1,366.78 = 548.45/x
  3. Step 3: Cross multiply
    990.53x = 1,366.78 × 548.45
  4. Step 4: Simplify right side
    990.53x = 749,610.49
  5. Step 5: Solve for x
    x = 749,610.49/990.53
  6. Step 6: Final answer
    x = 756.78

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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.