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Finding the Fourth Proportional to 776.46, 1,165.20 and 516.75

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Solution

The fourth proportional to 776.46, 1,165.20 and 516.75 is: 775.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.46 : 1,165.20 = 516.75 : x
  2. Step 2: Convert to fraction form
    776.46/1,165.20 = 516.75/x
  3. Step 3: Cross multiply
    776.46x = 1,165.20 × 516.75
  4. Step 4: Simplify right side
    776.46x = 602,117.10
  5. Step 5: Solve for x
    x = 602,117.10/776.46
  6. Step 6: Final answer
    x = 775.46

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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.