Home / 13,154.68-18,143.20-8,439.40

Finding the Fourth Proportional to 13,154.68, 18,143.20 and 8,439.40

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Solution

The fourth proportional to 13,154.68, 18,143.20 and 8,439.40 is: 11,639.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,154.68 : 18,143.20 = 8,439.40 : x
  2. Step 2: Convert to fraction form
    13,154.68/18,143.20 = 8,439.40/x
  3. Step 3: Cross multiply
    13,154.68x = 18,143.20 × 8,439.40
  4. Step 4: Simplify right side
    13,154.68x = 153,117,722.08
  5. Step 5: Solve for x
    x = 153,117,722.08/13,154.68
  6. Step 6: Final answer
    x = 11,639.79

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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.