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Finding the Fourth Proportional to 777.43, 1,162.70 and 691.37

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Solution

The fourth proportional to 777.43, 1,162.70 and 691.37 is: 1,033.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.43 : 1,162.70 = 691.37 : x
  2. Step 2: Convert to fraction form
    777.43/1,162.70 = 691.37/x
  3. Step 3: Cross multiply
    777.43x = 1,162.70 × 691.37
  4. Step 4: Simplify right side
    777.43x = 803,846.63
  5. Step 5: Solve for x
    x = 803,846.63/777.43
  6. Step 6: Final answer
    x = 1,033.99

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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.