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Finding the Fourth Proportional to 1,322.57, 1,986.95 and 1,138.05

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Solution

The fourth proportional to 1,322.57, 1,986.95 and 1,138.05 is: 1,709.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,322.57 : 1,986.95 = 1,138.05 : x
  2. Step 2: Convert to fraction form
    1,322.57/1,986.95 = 1,138.05/x
  3. Step 3: Cross multiply
    1,322.57x = 1,986.95 × 1,138.05
  4. Step 4: Simplify right side
    1,322.57x = 2,261,242.76
  5. Step 5: Solve for x
    x = 2,261,242.76/1,322.57
  6. Step 6: Final answer
    x = 1,709.73

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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.