Home / 5,420.30-7,479.96-3,181.78

Finding the Fourth Proportional to 5,420.30, 7,479.96 and 3,181.78

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Solution

The fourth proportional to 5,420.30, 7,479.96 and 3,181.78 is: 4,390.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.30 : 7,479.96 = 3,181.78 : x
  2. Step 2: Convert to fraction form
    5,420.30/7,479.96 = 3,181.78/x
  3. Step 3: Cross multiply
    5,420.30x = 7,479.96 × 3,181.78
  4. Step 4: Simplify right side
    5,420.30x = 23,799,587.13
  5. Step 5: Solve for x
    x = 23,799,587.13/5,420.30
  6. Step 6: Final answer
    x = 4,390.82

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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.