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Finding the Fourth Proportional to 668.43, 921.35 and 621.95

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Solution

The fourth proportional to 668.43, 921.35 and 621.95 is: 857.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.43 : 921.35 = 621.95 : x
  2. Step 2: Convert to fraction form
    668.43/921.35 = 621.95/x
  3. Step 3: Cross multiply
    668.43x = 921.35 × 621.95
  4. Step 4: Simplify right side
    668.43x = 573,036.61
  5. Step 5: Solve for x
    x = 573,036.61/668.43
  6. Step 6: Final answer
    x = 857.29

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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.