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Finding the Fourth Proportional to 17,139.40, 25,680.30 and 8,355.40

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Solution

The fourth proportional to 17,139.40, 25,680.30 and 8,355.40 is: 12,519.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,139.40 : 25,680.30 = 8,355.40 : x
  2. Step 2: Convert to fraction form
    17,139.40/25,680.30 = 8,355.40/x
  3. Step 3: Cross multiply
    17,139.40x = 25,680.30 × 8,355.40
  4. Step 4: Simplify right side
    17,139.40x = 214,569,178.62
  5. Step 5: Solve for x
    x = 214,569,178.62/17,139.40
  6. Step 6: Final answer
    x = 12,519.06

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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.