Home / 6,390.48-8,815.77-4,121.22

Finding the Fourth Proportional to 6,390.48, 8,815.77 and 4,121.22

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Solution

The fourth proportional to 6,390.48, 8,815.77 and 4,121.22 is: 5,685.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,390.48 : 8,815.77 = 4,121.22 : x
  2. Step 2: Convert to fraction form
    6,390.48/8,815.77 = 4,121.22/x
  3. Step 3: Cross multiply
    6,390.48x = 8,815.77 × 4,121.22
  4. Step 4: Simplify right side
    6,390.48x = 36,331,776.15
  5. Step 5: Solve for x
    x = 36,331,776.15/6,390.48
  6. Step 6: Final answer
    x = 5,685.30

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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.