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Finding the Fourth Proportional to 668.33, 922.28 and 388.61

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Solution

The fourth proportional to 668.33, 922.28 and 388.61 is: 536.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.33 : 922.28 = 388.61 : x
  2. Step 2: Convert to fraction form
    668.33/922.28 = 388.61/x
  3. Step 3: Cross multiply
    668.33x = 922.28 × 388.61
  4. Step 4: Simplify right side
    668.33x = 358,410.51
  5. Step 5: Solve for x
    x = 358,410.51/668.33
  6. Step 6: Final answer
    x = 536.28

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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.