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Finding the Fourth Proportional to 663.64, 920.08 and 626.74

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Solution

The fourth proportional to 663.64, 920.08 and 626.74 is: 868.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.64 : 920.08 = 626.74 : x
  2. Step 2: Convert to fraction form
    663.64/920.08 = 626.74/x
  3. Step 3: Cross multiply
    663.64x = 920.08 × 626.74
  4. Step 4: Simplify right side
    663.64x = 576,651.19
  5. Step 5: Solve for x
    x = 576,651.19/663.64
  6. Step 6: Final answer
    x = 868.92

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.