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Finding the Fourth Proportional to 665.13, 918.08 and 385.43

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Solution

The fourth proportional to 665.13, 918.08 and 385.43 is: 532.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.13 : 918.08 = 385.43 : x
  2. Step 2: Convert to fraction form
    665.13/918.08 = 385.43/x
  3. Step 3: Cross multiply
    665.13x = 918.08 × 385.43
  4. Step 4: Simplify right side
    665.13x = 353,857.39
  5. Step 5: Solve for x
    x = 353,857.39/665.13
  6. Step 6: Final answer
    x = 532.01

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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.