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Finding the Fourth Proportional to 1,861.64, 2,791.20 and 765.68

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Solution

The fourth proportional to 1,861.64, 2,791.20 and 765.68 is: 1,148.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,861.64 : 2,791.20 = 765.68 : x
  2. Step 2: Convert to fraction form
    1,861.64/2,791.20 = 765.68/x
  3. Step 3: Cross multiply
    1,861.64x = 2,791.20 × 765.68
  4. Step 4: Simplify right side
    1,861.64x = 2,137,166.02
  5. Step 5: Solve for x
    x = 2,137,166.02/1,861.64
  6. Step 6: Final answer
    x = 1,148.00

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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.