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Finding the Fourth Proportional to 20,555.66, 28,366.21 and 11,604

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Solution

The fourth proportional to 20,555.66, 28,366.21 and 11,604 is: 16,013.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,555.66 : 28,366.21 = 11,604 : x
  2. Step 2: Convert to fraction form
    20,555.66/28,366.21 = 11,604/x
  3. Step 3: Cross multiply
    20,555.66x = 28,366.21 × 11,604
  4. Step 4: Simplify right side
    20,555.66x = 329,161,500.84
  5. Step 5: Solve for x
    x = 329,161,500.84/20,555.66
  6. Step 6: Final answer
    x = 16,013.18

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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.