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Finding the Fourth Proportional to 1,665.87, 2,299.20 and 993.72

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Solution

The fourth proportional to 1,665.87, 2,299.20 and 993.72 is: 1,371.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,665.87 : 2,299.20 = 993.72 : x
  2. Step 2: Convert to fraction form
    1,665.87/2,299.20 = 993.72/x
  3. Step 3: Cross multiply
    1,665.87x = 2,299.20 × 993.72
  4. Step 4: Simplify right side
    1,665.87x = 2,284,764.75
  5. Step 5: Solve for x
    x = 2,284,764.75/1,665.87
  6. Step 6: Final answer
    x = 1,371.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.