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Finding the Fourth Proportional to 21,761.76, 30,024.48 and 12,806.40

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Solution

The fourth proportional to 21,761.76, 30,024.48 and 12,806.40 is: 17,668.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,761.76 : 30,024.48 = 12,806.40 : x
  2. Step 2: Convert to fraction form
    21,761.76/30,024.48 = 12,806.40/x
  3. Step 3: Cross multiply
    21,761.76x = 30,024.48 × 12,806.40
  4. Step 4: Simplify right side
    21,761.76x = 384,505,500.67
  5. Step 5: Solve for x
    x = 384,505,500.67/21,761.76
  6. Step 6: Final answer
    x = 17,668.86

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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.