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Finding the Fourth Proportional to 20,996.76, 28,975.10 and 11,436.76

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Solution

The fourth proportional to 20,996.76, 28,975.10 and 11,436.76 is: 15,782.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,996.76 : 28,975.10 = 11,436.76 : x
  2. Step 2: Convert to fraction form
    20,996.76/28,975.10 = 11,436.76/x
  3. Step 3: Cross multiply
    20,996.76x = 28,975.10 × 11,436.76
  4. Step 4: Simplify right side
    20,996.76x = 331,381,264.68
  5. Step 5: Solve for x
    x = 331,381,264.68/20,996.76
  6. Step 6: Final answer
    x = 15,782.50

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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.