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Finding the Fourth Proportional to 668.28, 922.08 and 388.53

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Solution

The fourth proportional to 668.28, 922.08 and 388.53 is: 536.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.28 : 922.08 = 388.53 : x
  2. Step 2: Convert to fraction form
    668.28/922.08 = 388.53/x
  3. Step 3: Cross multiply
    668.28x = 922.08 × 388.53
  4. Step 4: Simplify right side
    668.28x = 358,255.74
  5. Step 5: Solve for x
    x = 358,255.74/668.28
  6. Step 6: Final answer
    x = 536.09

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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.