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Finding the Fourth Proportional to 990.40, 1,366.82 and 597.44

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Solution

The fourth proportional to 990.40, 1,366.82 and 597.44 is: 824.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.40 : 1,366.82 = 597.44 : x
  2. Step 2: Convert to fraction form
    990.40/1,366.82 = 597.44/x
  3. Step 3: Cross multiply
    990.40x = 1,366.82 × 597.44
  4. Step 4: Simplify right side
    990.40x = 816,592.94
  5. Step 5: Solve for x
    x = 816,592.94/990.40
  6. Step 6: Final answer
    x = 824.51

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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.