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Finding the Fourth Proportional to 2,153.96, 3,230.96 and 1,385

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Solution

The fourth proportional to 2,153.96, 3,230.96 and 1,385 is: 2,077.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.96 : 3,230.96 = 1,385 : x
  2. Step 2: Convert to fraction form
    2,153.96/3,230.96 = 1,385/x
  3. Step 3: Cross multiply
    2,153.96x = 3,230.96 × 1,385
  4. Step 4: Simplify right side
    2,153.96x = 4,474,879.60
  5. Step 5: Solve for x
    x = 4,474,879.60/2,153.96
  6. Step 6: Final answer
    x = 2,077.51

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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.