Home / 3,078.30-4,247.82-1,681.05

Finding the Fourth Proportional to 3,078.30, 4,247.82 and 1,681.05

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Solution

The fourth proportional to 3,078.30, 4,247.82 and 1,681.05 is: 2,319.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.30 : 4,247.82 = 1,681.05 : x
  2. Step 2: Convert to fraction form
    3,078.30/4,247.82 = 1,681.05/x
  3. Step 3: Cross multiply
    3,078.30x = 4,247.82 × 1,681.05
  4. Step 4: Simplify right side
    3,078.30x = 7,140,797.81
  5. Step 5: Solve for x
    x = 7,140,797.81/3,078.30
  6. Step 6: Final answer
    x = 2,319.72

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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.