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Finding the Fourth Proportional to 1,181.60, 1,771.86 and 487.76

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Solution

The fourth proportional to 1,181.60, 1,771.86 and 487.76 is: 731.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,181.60 : 1,771.86 = 487.76 : x
  2. Step 2: Convert to fraction form
    1,181.60/1,771.86 = 487.76/x
  3. Step 3: Cross multiply
    1,181.60x = 1,771.86 × 487.76
  4. Step 4: Simplify right side
    1,181.60x = 864,242.43
  5. Step 5: Solve for x
    x = 864,242.43/1,181.60
  6. Step 6: Final answer
    x = 731.42

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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.