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Finding the Fourth Proportional to 2,409.12, 3,614.40 and 765.90

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Solution

The fourth proportional to 2,409.12, 3,614.40 and 765.90 is: 1,149.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,409.12 : 3,614.40 = 765.90 : x
  2. Step 2: Convert to fraction form
    2,409.12/3,614.40 = 765.90/x
  3. Step 3: Cross multiply
    2,409.12x = 3,614.40 × 765.90
  4. Step 4: Simplify right side
    2,409.12x = 2,768,268.96
  5. Step 5: Solve for x
    x = 2,768,268.96/2,409.12
  6. Step 6: Final answer
    x = 1,149.08

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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.