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Finding the Fourth Proportional to 1,138.61, 1,709.84 and 1,080.16

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Solution

The fourth proportional to 1,138.61, 1,709.84 and 1,080.16 is: 1,622.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.61 : 1,709.84 = 1,080.16 : x
  2. Step 2: Convert to fraction form
    1,138.61/1,709.84 = 1,080.16/x
  3. Step 3: Cross multiply
    1,138.61x = 1,709.84 × 1,080.16
  4. Step 4: Simplify right side
    1,138.61x = 1,846,899.20
  5. Step 5: Solve for x
    x = 1,846,899.20/1,138.61
  6. Step 6: Final answer
    x = 1,622.06

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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.