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Finding the Fourth Proportional to 1,605.12, 2,212.02 and 1,138.56

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Solution

The fourth proportional to 1,605.12, 2,212.02 and 1,138.56 is: 1,569.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.12 : 2,212.02 = 1,138.56 : x
  2. Step 2: Convert to fraction form
    1,605.12/2,212.02 = 1,138.56/x
  3. Step 3: Cross multiply
    1,605.12x = 2,212.02 × 1,138.56
  4. Step 4: Simplify right side
    1,605.12x = 2,518,517.49
  5. Step 5: Solve for x
    x = 2,518,517.49/1,605.12
  6. Step 6: Final answer
    x = 1,569.05

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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.