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Finding the Fourth Proportional to 665.98, 918.98 and 386.18

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Solution

The fourth proportional to 665.98, 918.98 and 386.18 is: 532.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.98 : 918.98 = 386.18 : x
  2. Step 2: Convert to fraction form
    665.98/918.98 = 386.18/x
  3. Step 3: Cross multiply
    665.98x = 918.98 × 386.18
  4. Step 4: Simplify right side
    665.98x = 354,891.70
  5. Step 5: Solve for x
    x = 354,891.70/665.98
  6. Step 6: Final answer
    x = 532.89

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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.