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Finding the Fourth Proportional to 1,138.96, 1,710.06 and 1,079.20

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Solution

The fourth proportional to 1,138.96, 1,710.06 and 1,079.20 is: 1,620.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.96 : 1,710.06 = 1,079.20 : x
  2. Step 2: Convert to fraction form
    1,138.96/1,710.06 = 1,079.20/x
  3. Step 3: Cross multiply
    1,138.96x = 1,710.06 × 1,079.20
  4. Step 4: Simplify right side
    1,138.96x = 1,845,496.75
  5. Step 5: Solve for x
    x = 1,845,496.75/1,138.96
  6. Step 6: Final answer
    x = 1,620.34

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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.