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Finding the Fourth Proportional to 21,375.48, 29,499.66 and 13,923.48

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Solution

The fourth proportional to 21,375.48, 29,499.66 and 13,923.48 is: 19,215.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,375.48 : 29,499.66 = 13,923.48 : x
  2. Step 2: Convert to fraction form
    21,375.48/29,499.66 = 13,923.48/x
  3. Step 3: Cross multiply
    21,375.48x = 29,499.66 × 13,923.48
  4. Step 4: Simplify right side
    21,375.48x = 410,737,926.02
  5. Step 5: Solve for x
    x = 410,737,926.02/21,375.48
  6. Step 6: Final answer
    x = 19,215.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.