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Finding the Fourth Proportional to 668.67, 922.82 and 388.99

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Solution

The fourth proportional to 668.67, 922.82 and 388.99 is: 536.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.67 : 922.82 = 388.99 : x
  2. Step 2: Convert to fraction form
    668.67/922.82 = 388.99/x
  3. Step 3: Cross multiply
    668.67x = 922.82 × 388.99
  4. Step 4: Simplify right side
    668.67x = 358,967.75
  5. Step 5: Solve for x
    x = 358,967.75/668.67
  6. Step 6: Final answer
    x = 536.84

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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.