Home / 13,470.28-20,209.47-8,139.40

Finding the Fourth Proportional to 13,470.28, 20,209.47 and 8,139.40

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Solution

The fourth proportional to 13,470.28, 20,209.47 and 8,139.40 is: 12,211.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,470.28 : 20,209.47 = 8,139.40 : x
  2. Step 2: Convert to fraction form
    13,470.28/20,209.47 = 8,139.40/x
  3. Step 3: Cross multiply
    13,470.28x = 20,209.47 × 8,139.40
  4. Step 4: Simplify right side
    13,470.28x = 164,492,960.12
  5. Step 5: Solve for x
    x = 164,492,960.12/13,470.28
  6. Step 6: Final answer
    x = 12,211.55

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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.