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Finding the Fourth Proportional to 990.97, 1,367.50 and 548.89

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Solution

The fourth proportional to 990.97, 1,367.50 and 548.89 is: 757.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.97 : 1,367.50 = 548.89 : x
  2. Step 2: Convert to fraction form
    990.97/1,367.50 = 548.89/x
  3. Step 3: Cross multiply
    990.97x = 1,367.50 × 548.89
  4. Step 4: Simplify right side
    990.97x = 750,607.08
  5. Step 5: Solve for x
    x = 750,607.08/990.97
  6. Step 6: Final answer
    x = 757.45

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1.5x scale

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.