Home / 12,139.20-16,718.40-9,339.84

Finding the Fourth Proportional to 12,139.20, 16,718.40 and 9,339.84

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Solution

The fourth proportional to 12,139.20, 16,718.40 and 9,339.84 is: 12,863.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.20 : 16,718.40 = 9,339.84 : x
  2. Step 2: Convert to fraction form
    12,139.20/16,718.40 = 9,339.84/x
  3. Step 3: Cross multiply
    12,139.20x = 16,718.40 × 9,339.84
  4. Step 4: Simplify right side
    12,139.20x = 156,147,181.06
  5. Step 5: Solve for x
    x = 156,147,181.06/12,139.20
  6. Step 6: Final answer
    x = 12,863.05

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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.