Home / 12,139.60-18,166.20-8,424.40

Finding the Fourth Proportional to 12,139.60, 18,166.20 and 8,424.40

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Solution

The fourth proportional to 12,139.60, 18,166.20 and 8,424.40 is: 12,606.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,139.60 : 18,166.20 = 8,424.40 : x
  2. Step 2: Convert to fraction form
    12,139.60/18,166.20 = 8,424.40/x
  3. Step 3: Cross multiply
    12,139.60x = 18,166.20 × 8,424.40
  4. Step 4: Simplify right side
    12,139.60x = 153,039,335.28
  5. Step 5: Solve for x
    x = 153,039,335.28/12,139.60
  6. Step 6: Final answer
    x = 12,606.62

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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.