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Finding the Fourth Proportional to 665.84, 918.84 and 386.09

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Solution

The fourth proportional to 665.84, 918.84 and 386.09 is: 532.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.84 : 918.84 = 386.09 : x
  2. Step 2: Convert to fraction form
    665.84/918.84 = 386.09/x
  3. Step 3: Cross multiply
    665.84x = 918.84 × 386.09
  4. Step 4: Simplify right side
    665.84x = 354,750.34
  5. Step 5: Solve for x
    x = 354,750.34/665.84
  6. Step 6: Final answer
    x = 532.79

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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.