Home / 5,420.88-8,128.62-2,647.71

Finding the Fourth Proportional to 5,420.88, 8,128.62 and 2,647.71

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Solution

The fourth proportional to 5,420.88, 8,128.62 and 2,647.71 is: 3,970.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.88 : 8,128.62 = 2,647.71 : x
  2. Step 2: Convert to fraction form
    5,420.88/8,128.62 = 2,647.71/x
  3. Step 3: Cross multiply
    5,420.88x = 8,128.62 × 2,647.71
  4. Step 4: Simplify right side
    5,420.88x = 21,522,228.46
  5. Step 5: Solve for x
    x = 21,522,228.46/5,420.88
  6. Step 6: Final answer
    x = 3,970.25

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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.