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Finding the Fourth Proportional to 1,296.42, 1,945.40 and 516.80

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Solution

The fourth proportional to 1,296.42, 1,945.40 and 516.80 is: 775.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.42 : 1,945.40 = 516.80 : x
  2. Step 2: Convert to fraction form
    1,296.42/1,945.40 = 516.80/x
  3. Step 3: Cross multiply
    1,296.42x = 1,945.40 × 516.80
  4. Step 4: Simplify right side
    1,296.42x = 1,005,376.96
  5. Step 5: Solve for x
    x = 1,005,376.96/1,296.42
  6. Step 6: Final answer
    x = 775.50

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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.