Home / 8,320.60-12,480.85-3,390.60

Finding the Fourth Proportional to 8,320.60, 12,480.85 and 3,390.60

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Solution

The fourth proportional to 8,320.60, 12,480.85 and 3,390.60 is: 5,085.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,320.60 : 12,480.85 = 3,390.60 : x
  2. Step 2: Convert to fraction form
    8,320.60/12,480.85 = 3,390.60/x
  3. Step 3: Cross multiply
    8,320.60x = 12,480.85 × 3,390.60
  4. Step 4: Simplify right side
    8,320.60x = 42,317,570.01
  5. Step 5: Solve for x
    x = 42,317,570.01/8,320.60
  6. Step 6: Final answer
    x = 5,085.88

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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.