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Finding the Fourth Proportional to 668.73, 922.98 and 388.98

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Solution

The fourth proportional to 668.73, 922.98 and 388.98 is: 536.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.73 : 922.98 = 388.98 : x
  2. Step 2: Convert to fraction form
    668.73/922.98 = 388.98/x
  3. Step 3: Cross multiply
    668.73x = 922.98 × 388.98
  4. Step 4: Simplify right side
    668.73x = 359,020.76
  5. Step 5: Solve for x
    x = 359,020.76/668.73
  6. Step 6: Final answer
    x = 536.87

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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.