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Finding the Fourth Proportional to 14,355, 21,542.28 and 5,121

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Solution

The fourth proportional to 14,355, 21,542.28 and 5,121 is: 7,684.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,355 : 21,542.28 = 5,121 : x
  2. Step 2: Convert to fraction form
    14,355/21,542.28 = 5,121/x
  3. Step 3: Cross multiply
    14,355x = 21,542.28 × 5,121
  4. Step 4: Simplify right side
    14,355x = 110,318,015.88
  5. Step 5: Solve for x
    x = 110,318,015.88/14,355
  6. Step 6: Final answer
    x = 7,684.99

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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.