Home / 2,778.80-4,166.40-1,320.08

Finding the Fourth Proportional to 2,778.80, 4,166.40 and 1,320.08

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Solution

The fourth proportional to 2,778.80, 4,166.40 and 1,320.08 is: 1,979.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,778.80 : 4,166.40 = 1,320.08 : x
  2. Step 2: Convert to fraction form
    2,778.80/4,166.40 = 1,320.08/x
  3. Step 3: Cross multiply
    2,778.80x = 4,166.40 × 1,320.08
  4. Step 4: Simplify right side
    2,778.80x = 5,499,981.31
  5. Step 5: Solve for x
    x = 5,499,981.31/2,778.80
  6. Step 6: Final answer
    x = 1,979.26

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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.