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Finding the Fourth Proportional to 6,640.80, 9,968.40 and 5,186.40

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Solution

The fourth proportional to 6,640.80, 9,968.40 and 5,186.40 is: 7,785.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640.80 : 9,968.40 = 5,186.40 : x
  2. Step 2: Convert to fraction form
    6,640.80/9,968.40 = 5,186.40/x
  3. Step 3: Cross multiply
    6,640.80x = 9,968.40 × 5,186.40
  4. Step 4: Simplify right side
    6,640.80x = 51,700,109.76
  5. Step 5: Solve for x
    x = 51,700,109.76/6,640.80
  6. Step 6: Final answer
    x = 7,785.22

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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.