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Finding the Fourth Proportional to 3,181.38, 4,772.68 and 989.66

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Solution

The fourth proportional to 3,181.38, 4,772.68 and 989.66 is: 1,484.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,181.38 : 4,772.68 = 989.66 : x
  2. Step 2: Convert to fraction form
    3,181.38/4,772.68 = 989.66/x
  3. Step 3: Cross multiply
    3,181.38x = 4,772.68 × 989.66
  4. Step 4: Simplify right side
    3,181.38x = 4,723,330.49
  5. Step 5: Solve for x
    x = 4,723,330.49/3,181.38
  6. Step 6: Final answer
    x = 1,484.68

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1.5x scale

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.