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Finding the Fourth Proportional to 11,115.40, 16,640.70 and 9,819.40

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Solution

The fourth proportional to 11,115.40, 16,640.70 and 9,819.40 is: 14,700.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,115.40 : 16,640.70 = 9,819.40 : x
  2. Step 2: Convert to fraction form
    11,115.40/16,640.70 = 9,819.40/x
  3. Step 3: Cross multiply
    11,115.40x = 16,640.70 × 9,819.40
  4. Step 4: Simplify right side
    11,115.40x = 163,401,689.58
  5. Step 5: Solve for x
    x = 163,401,689.58/11,115.40
  6. Step 6: Final answer
    x = 14,700.48

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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.