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Finding the Fourth Proportional to 10,620.91, 15,900.21 and 7,447.34

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Solution

The fourth proportional to 10,620.91, 15,900.21 and 7,447.34 is: 11,149.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,620.91 : 15,900.21 = 7,447.34 : x
  2. Step 2: Convert to fraction form
    10,620.91/15,900.21 = 7,447.34/x
  3. Step 3: Cross multiply
    10,620.91x = 15,900.21 × 7,447.34
  4. Step 4: Simplify right side
    10,620.91x = 118,414,309.69
  5. Step 5: Solve for x
    x = 118,414,309.69/10,620.91
  6. Step 6: Final answer
    x = 11,149.17

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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.