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Finding the Fourth Proportional to 21,615.96, 29,830.50 and 12,664.92

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Solution

The fourth proportional to 21,615.96, 29,830.50 and 12,664.92 is: 17,477.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,615.96 : 29,830.50 = 12,664.92 : x
  2. Step 2: Convert to fraction form
    21,615.96/29,830.50 = 12,664.92/x
  3. Step 3: Cross multiply
    21,615.96x = 29,830.50 × 12,664.92
  4. Step 4: Simplify right side
    21,615.96x = 377,800,896.06
  5. Step 5: Solve for x
    x = 377,800,896.06/21,615.96
  6. Step 6: Final answer
    x = 17,477.87

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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.