Home / 12,345.24-18,512.21-5,321.90

Finding the Fourth Proportional to 12,345.24, 18,512.21 and 5,321.90

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Solution

The fourth proportional to 12,345.24, 18,512.21 and 5,321.90 is: 7,980.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,345.24 : 18,512.21 = 5,321.90 : x
  2. Step 2: Convert to fraction form
    12,345.24/18,512.21 = 5,321.90/x
  3. Step 3: Cross multiply
    12,345.24x = 18,512.21 × 5,321.90
  4. Step 4: Simplify right side
    12,345.24x = 98,520,189.98
  5. Step 5: Solve for x
    x = 98,520,189.98/12,345.24
  6. Step 6: Final answer
    x = 7,980.42

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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.