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Finding the Fourth Proportional to 643.68, 960.66 and 626.40

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Solution

The fourth proportional to 643.68, 960.66 and 626.40 is: 934.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.68 : 960.66 = 626.40 : x
  2. Step 2: Convert to fraction form
    643.68/960.66 = 626.40/x
  3. Step 3: Cross multiply
    643.68x = 960.66 × 626.40
  4. Step 4: Simplify right side
    643.68x = 601,757.42
  5. Step 5: Solve for x
    x = 601,757.42/643.68
  6. Step 6: Final answer
    x = 934.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.