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Finding the Fourth Proportional to 1,311.77, 1,964.40 and 762.29

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Solution

The fourth proportional to 1,311.77, 1,964.40 and 762.29 is: 1,141.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.77 : 1,964.40 = 762.29 : x
  2. Step 2: Convert to fraction form
    1,311.77/1,964.40 = 762.29/x
  3. Step 3: Cross multiply
    1,311.77x = 1,964.40 × 762.29
  4. Step 4: Simplify right side
    1,311.77x = 1,497,442.48
  5. Step 5: Solve for x
    x = 1,497,442.48/1,311.77
  6. Step 6: Final answer
    x = 1,141.54

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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.