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Finding the Fourth Proportional to 665.82, 918.77 and 400.23

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Solution

The fourth proportional to 665.82, 918.77 and 400.23 is: 552.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.82 : 918.77 = 400.23 : x
  2. Step 2: Convert to fraction form
    665.82/918.77 = 400.23/x
  3. Step 3: Cross multiply
    665.82x = 918.77 × 400.23
  4. Step 4: Simplify right side
    665.82x = 367,717.32
  5. Step 5: Solve for x
    x = 367,717.32/665.82
  6. Step 6: Final answer
    x = 552.28

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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.