Home / 3,109.12-4,288.80-1,866.40

Finding the Fourth Proportional to 3,109.12, 4,288.80 and 1,866.40

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Solution

The fourth proportional to 3,109.12, 4,288.80 and 1,866.40 is: 2,574.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.12 : 4,288.80 = 1,866.40 : x
  2. Step 2: Convert to fraction form
    3,109.12/4,288.80 = 1,866.40/x
  3. Step 3: Cross multiply
    3,109.12x = 4,288.80 × 1,866.40
  4. Step 4: Simplify right side
    3,109.12x = 8,004,616.32
  5. Step 5: Solve for x
    x = 8,004,616.32/3,109.12
  6. Step 6: Final answer
    x = 2,574.56

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1.5x scale

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.