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Finding the Fourth Proportional to 1,913.57, 2,870.33 and 615

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Solution

The fourth proportional to 1,913.57, 2,870.33 and 615 is: 922.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.57 : 2,870.33 = 615 : x
  2. Step 2: Convert to fraction form
    1,913.57/2,870.33 = 615/x
  3. Step 3: Cross multiply
    1,913.57x = 2,870.33 × 615
  4. Step 4: Simplify right side
    1,913.57x = 1,765,249.88
  5. Step 5: Solve for x
    x = 1,765,249.88/1,913.57
  6. Step 6: Final answer
    x = 922.49

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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.