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Finding the Fourth Proportional to 21,372.84, 29,489.85 and 12,415.73

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Solution

The fourth proportional to 21,372.84, 29,489.85 and 12,415.73 is: 17,130.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,372.84 : 29,489.85 = 12,415.73 : x
  2. Step 2: Convert to fraction form
    21,372.84/29,489.85 = 12,415.73/x
  3. Step 3: Cross multiply
    21,372.84x = 29,489.85 × 12,415.73
  4. Step 4: Simplify right side
    21,372.84x = 366,137,867.89
  5. Step 5: Solve for x
    x = 366,137,867.89/21,372.84
  6. Step 6: Final answer
    x = 17,130.99

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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.