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Finding the Fourth Proportional to 1,330.68, 1,994.62 and 636.30

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Solution

The fourth proportional to 1,330.68, 1,994.62 and 636.30 is: 953.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.68 : 1,994.62 = 636.30 : x
  2. Step 2: Convert to fraction form
    1,330.68/1,994.62 = 636.30/x
  3. Step 3: Cross multiply
    1,330.68x = 1,994.62 × 636.30
  4. Step 4: Simplify right side
    1,330.68x = 1,269,176.71
  5. Step 5: Solve for x
    x = 1,269,176.71/1,330.68
  6. Step 6: Final answer
    x = 953.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.