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Finding the Fourth Proportional to 7,806.78, 11,710.14 and 3,128.88

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Solution

The fourth proportional to 7,806.78, 11,710.14 and 3,128.88 is: 4,693.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,806.78 : 11,710.14 = 3,128.88 : x
  2. Step 2: Convert to fraction form
    7,806.78/11,710.14 = 3,128.88/x
  3. Step 3: Cross multiply
    7,806.78x = 11,710.14 × 3,128.88
  4. Step 4: Simplify right side
    7,806.78x = 36,639,622.84
  5. Step 5: Solve for x
    x = 36,639,622.84/7,806.78
  6. Step 6: Final answer
    x = 4,693.31

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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.