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Finding the Fourth Proportional to 7,428, 11,147.12 and 2,564

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Solution

The fourth proportional to 7,428, 11,147.12 and 2,564 is: 3,847.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,428 : 11,147.12 = 2,564 : x
  2. Step 2: Convert to fraction form
    7,428/11,147.12 = 2,564/x
  3. Step 3: Cross multiply
    7,428x = 11,147.12 × 2,564
  4. Step 4: Simplify right side
    7,428x = 28,581,215.68
  5. Step 5: Solve for x
    x = 28,581,215.68/7,428
  6. Step 6: Final answer
    x = 3,847.77

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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.