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Finding the Fourth Proportional to 665.39, 918.16 and 385.56

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Solution

The fourth proportional to 665.39, 918.16 and 385.56 is: 532.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.39 : 918.16 = 385.56 : x
  2. Step 2: Convert to fraction form
    665.39/918.16 = 385.56/x
  3. Step 3: Cross multiply
    665.39x = 918.16 × 385.56
  4. Step 4: Simplify right side
    665.39x = 354,004.81
  5. Step 5: Solve for x
    x = 354,004.81/665.39
  6. Step 6: Final answer
    x = 532.02

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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.