Home / 5,420.55-8,128.80-3,772.20

Finding the Fourth Proportional to 5,420.55, 8,128.80 and 3,772.20

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Solution

The fourth proportional to 5,420.55, 8,128.80 and 3,772.20 is: 5,656.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.55 : 8,128.80 = 3,772.20 : x
  2. Step 2: Convert to fraction form
    5,420.55/8,128.80 = 3,772.20/x
  3. Step 3: Cross multiply
    5,420.55x = 8,128.80 × 3,772.20
  4. Step 4: Simplify right side
    5,420.55x = 30,663,459.36
  5. Step 5: Solve for x
    x = 30,663,459.36/5,420.55
  6. Step 6: Final answer
    x = 5,656.89

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1.5x scale

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.