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Finding the Fourth Proportional to 1,903.79, 2,855.68 and 517.12

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Solution

The fourth proportional to 1,903.79, 2,855.68 and 517.12 is: 775.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,903.79 : 2,855.68 = 517.12 : x
  2. Step 2: Convert to fraction form
    1,903.79/2,855.68 = 517.12/x
  3. Step 3: Cross multiply
    1,903.79x = 2,855.68 × 517.12
  4. Step 4: Simplify right side
    1,903.79x = 1,476,731.52
  5. Step 5: Solve for x
    x = 1,476,731.52/1,903.79
  6. Step 6: Final answer
    x = 775.68

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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.