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Finding the Fourth Proportional to 11,115.70, 16,685.70 and 6,960.40

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Solution

The fourth proportional to 11,115.70, 16,685.70 and 6,960.40 is: 10,448.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,115.70 : 16,685.70 = 6,960.40 : x
  2. Step 2: Convert to fraction form
    11,115.70/16,685.70 = 6,960.40/x
  3. Step 3: Cross multiply
    11,115.70x = 16,685.70 × 6,960.40
  4. Step 4: Simplify right side
    11,115.70x = 116,139,146.28
  5. Step 5: Solve for x
    x = 116,139,146.28/11,115.70
  6. Step 6: Final answer
    x = 10,448.21

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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.