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Finding the Fourth Proportional to 1,903.40, 2,855.35 and 516.78

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Solution

The fourth proportional to 1,903.40, 2,855.35 and 516.78 is: 775.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,903.40 : 2,855.35 = 516.78 : x
  2. Step 2: Convert to fraction form
    1,903.40/2,855.35 = 516.78/x
  3. Step 3: Cross multiply
    1,903.40x = 2,855.35 × 516.78
  4. Step 4: Simplify right side
    1,903.40x = 1,475,588.42
  5. Step 5: Solve for x
    x = 1,475,588.42/1,903.40
  6. Step 6: Final answer
    x = 775.24

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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.