Home / 18,129.86-25,038.22-12,479.20

Finding the Fourth Proportional to 18,129.86, 25,038.22 and 12,479.20

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Solution

The fourth proportional to 18,129.86, 25,038.22 and 12,479.20 is: 17,234.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,129.86 : 25,038.22 = 12,479.20 : x
  2. Step 2: Convert to fraction form
    18,129.86/25,038.22 = 12,479.20/x
  3. Step 3: Cross multiply
    18,129.86x = 25,038.22 × 12,479.20
  4. Step 4: Simplify right side
    18,129.86x = 312,456,955.02
  5. Step 5: Solve for x
    x = 312,456,955.02/18,129.86
  6. Step 6: Final answer
    x = 17,234.38

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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.