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Finding the Fourth Proportional to 989.54, 1,366.21 and 591.31

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Solution

The fourth proportional to 989.54, 1,366.21 and 591.31 is: 816.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.54 : 1,366.21 = 591.31 : x
  2. Step 2: Convert to fraction form
    989.54/1,366.21 = 591.31/x
  3. Step 3: Cross multiply
    989.54x = 1,366.21 × 591.31
  4. Step 4: Simplify right side
    989.54x = 807,853.64
  5. Step 5: Solve for x
    x = 807,853.64/989.54
  6. Step 6: Final answer
    x = 816.39

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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.