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Finding the Fourth Proportional to 2,340.19, 3,509.39 and 779.90

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Solution

The fourth proportional to 2,340.19, 3,509.39 and 779.90 is: 1,169.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,340.19 : 3,509.39 = 779.90 : x
  2. Step 2: Convert to fraction form
    2,340.19/3,509.39 = 779.90/x
  3. Step 3: Cross multiply
    2,340.19x = 3,509.39 × 779.90
  4. Step 4: Simplify right side
    2,340.19x = 2,736,957.66
  5. Step 5: Solve for x
    x = 2,736,957.66/2,340.19
  6. Step 6: Final answer
    x = 1,169.54

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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.