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Finding the Fourth Proportional to 1,903.68, 2,855.16 and 749.28

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Solution

The fourth proportional to 1,903.68, 2,855.16 and 749.28 is: 1,123.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,903.68 : 2,855.16 = 749.28 : x
  2. Step 2: Convert to fraction form
    1,903.68/2,855.16 = 749.28/x
  3. Step 3: Cross multiply
    1,903.68x = 2,855.16 × 749.28
  4. Step 4: Simplify right side
    1,903.68x = 2,139,314.28
  5. Step 5: Solve for x
    x = 2,139,314.28/1,903.68
  6. Step 6: Final answer
    x = 1,123.78

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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.