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Finding the Fourth Proportional to 21,453.71, 29,599.16 and 13,905.92

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Solution

The fourth proportional to 21,453.71, 29,599.16 and 13,905.92 is: 19,185.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,453.71 : 29,599.16 = 13,905.92 : x
  2. Step 2: Convert to fraction form
    21,453.71/29,599.16 = 13,905.92/x
  3. Step 3: Cross multiply
    21,453.71x = 29,599.16 × 13,905.92
  4. Step 4: Simplify right side
    21,453.71x = 411,603,555.50
  5. Step 5: Solve for x
    x = 411,603,555.50/21,453.71
  6. Step 6: Final answer
    x = 19,185.66

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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.