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Finding the Fourth Proportional to 10,921, 16,381.50 and 3,625

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Solution

The fourth proportional to 10,921, 16,381.50 and 3,625 is: 5,437.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,921 : 16,381.50 = 3,625 : x
  2. Step 2: Convert to fraction form
    10,921/16,381.50 = 3,625/x
  3. Step 3: Cross multiply
    10,921x = 16,381.50 × 3,625
  4. Step 4: Simplify right side
    10,921x = 59,382,937.50
  5. Step 5: Solve for x
    x = 59,382,937.50/10,921
  6. Step 6: Final answer
    x = 5,437.50

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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.