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Finding the Fourth Proportional to 668.53, 922.56 and 388.82

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Solution

The fourth proportional to 668.53, 922.56 and 388.82 is: 536.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.53 : 922.56 = 388.82 : x
  2. Step 2: Convert to fraction form
    668.53/922.56 = 388.82/x
  3. Step 3: Cross multiply
    668.53x = 922.56 × 388.82
  4. Step 4: Simplify right side
    668.53x = 358,709.78
  5. Step 5: Solve for x
    x = 358,709.78/668.53
  6. Step 6: Final answer
    x = 536.57

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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.