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Finding the Fourth Proportional to 20,908.52, 28,854.50 and 11,477.80

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Solution

The fourth proportional to 20,908.52, 28,854.50 and 11,477.80 is: 15,839.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,908.52 : 28,854.50 = 11,477.80 : x
  2. Step 2: Convert to fraction form
    20,908.52/28,854.50 = 11,477.80/x
  3. Step 3: Cross multiply
    20,908.52x = 28,854.50 × 11,477.80
  4. Step 4: Simplify right side
    20,908.52x = 331,186,180.10
  5. Step 5: Solve for x
    x = 331,186,180.10/20,908.52
  6. Step 6: Final answer
    x = 15,839.77

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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.