Home / 12,345.20-18,520.72-3,580.32

Finding the Fourth Proportional to 12,345.20, 18,520.72 and 3,580.32

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Solution

The fourth proportional to 12,345.20, 18,520.72 and 3,580.32 is: 5,371.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,345.20 : 18,520.72 = 3,580.32 : x
  2. Step 2: Convert to fraction form
    12,345.20/18,520.72 = 3,580.32/x
  3. Step 3: Cross multiply
    12,345.20x = 18,520.72 × 3,580.32
  4. Step 4: Simplify right side
    12,345.20x = 66,310,104.23
  5. Step 5: Solve for x
    x = 66,310,104.23/12,345.20
  6. Step 6: Final answer
    x = 5,371.33

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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.