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Finding the Fourth Proportional to 1,983, 2,974.50 and 615

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Solution

The fourth proportional to 1,983, 2,974.50 and 615 is: 922.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,983 : 2,974.50 = 615 : x
  2. Step 2: Convert to fraction form
    1,983/2,974.50 = 615/x
  3. Step 3: Cross multiply
    1,983x = 2,974.50 × 615
  4. Step 4: Simplify right side
    1,983x = 1,829,317.50
  5. Step 5: Solve for x
    x = 1,829,317.50/1,983
  6. Step 6: Final answer
    x = 922.50

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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.