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Finding the Fourth Proportional to 665.33, 918.23 and 385.47

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Solution

The fourth proportional to 665.33, 918.23 and 385.47 is: 531.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.33 : 918.23 = 385.47 : x
  2. Step 2: Convert to fraction form
    665.33/918.23 = 385.47/x
  3. Step 3: Cross multiply
    665.33x = 918.23 × 385.47
  4. Step 4: Simplify right side
    665.33x = 353,948.19
  5. Step 5: Solve for x
    x = 353,948.19/665.33
  6. Step 6: Final answer
    x = 531.99

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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.