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Finding the Fourth Proportional to 21,372.48, 29,495.52 and 13,920.48

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Solution

The fourth proportional to 21,372.48, 29,495.52 and 13,920.48 is: 19,211.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,372.48 : 29,495.52 = 13,920.48 : x
  2. Step 2: Convert to fraction form
    21,372.48/29,495.52 = 13,920.48/x
  3. Step 3: Cross multiply
    21,372.48x = 29,495.52 × 13,920.48
  4. Step 4: Simplify right side
    21,372.48x = 410,591,796.25
  5. Step 5: Solve for x
    x = 410,591,796.25/21,372.48
  6. Step 6: Final answer
    x = 19,211.24

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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.