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Finding the Fourth Proportional to 668.38, 921.95 and 431.95

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Solution

The fourth proportional to 668.38, 921.95 and 431.95 is: 595.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.38 : 921.95 = 431.95 : x
  2. Step 2: Convert to fraction form
    668.38/921.95 = 431.95/x
  3. Step 3: Cross multiply
    668.38x = 921.95 × 431.95
  4. Step 4: Simplify right side
    668.38x = 398,232.77
  5. Step 5: Solve for x
    x = 398,232.77/668.38
  6. Step 6: Final answer
    x = 595.82

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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.