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Finding the Fourth Proportional to 665.97, 918.67 and 591.13

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Solution

The fourth proportional to 665.97, 918.67 and 591.13 is: 815.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.97 : 918.67 = 591.13 : x
  2. Step 2: Convert to fraction form
    665.97/918.67 = 591.13/x
  3. Step 3: Cross multiply
    665.97x = 918.67 × 591.13
  4. Step 4: Simplify right side
    665.97x = 543,052.96
  5. Step 5: Solve for x
    x = 543,052.96/665.97
  6. Step 6: Final answer
    x = 815.44

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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.