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Finding the Fourth Proportional to 649.68, 969.18 and 627.72

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Solution

The fourth proportional to 649.68, 969.18 and 627.72 is: 936.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.68 : 969.18 = 627.72 : x
  2. Step 2: Convert to fraction form
    649.68/969.18 = 627.72/x
  3. Step 3: Cross multiply
    649.68x = 969.18 × 627.72
  4. Step 4: Simplify right side
    649.68x = 608,373.67
  5. Step 5: Solve for x
    x = 608,373.67/649.68
  6. Step 6: Final answer
    x = 936.42

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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.