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Finding the Fourth Proportional to 668.59, 922.85 and 388.95

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Solution

The fourth proportional to 668.59, 922.85 and 388.95 is: 536.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.59 : 922.85 = 388.95 : x
  2. Step 2: Convert to fraction form
    668.59/922.85 = 388.95/x
  3. Step 3: Cross multiply
    668.59x = 922.85 × 388.95
  4. Step 4: Simplify right side
    668.59x = 358,942.51
  5. Step 5: Solve for x
    x = 358,942.51/668.59
  6. Step 6: Final answer
    x = 536.86

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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.