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Finding the Fourth Proportional to 990.31, 1,366.61 and 548.22

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Solution

The fourth proportional to 990.31, 1,366.61 and 548.22 is: 756.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.31 : 1,366.61 = 548.22 : x
  2. Step 2: Convert to fraction form
    990.31/1,366.61 = 548.22/x
  3. Step 3: Cross multiply
    990.31x = 1,366.61 × 548.22
  4. Step 4: Simplify right side
    990.31x = 749,202.93
  5. Step 5: Solve for x
    x = 749,202.93/990.31
  6. Step 6: Final answer
    x = 756.53

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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.