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Finding the Fourth Proportional to 20,980.10, 28,949.49 and 11,904.05

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Solution

The fourth proportional to 20,980.10, 28,949.49 and 11,904.05 is: 16,425.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,980.10 : 28,949.49 = 11,904.05 : x
  2. Step 2: Convert to fraction form
    20,980.10/28,949.49 = 11,904.05/x
  3. Step 3: Cross multiply
    20,980.10x = 28,949.49 × 11,904.05
  4. Step 4: Simplify right side
    20,980.10x = 344,616,248.81
  5. Step 5: Solve for x
    x = 344,616,248.81/20,980.10
  6. Step 6: Final answer
    x = 16,425.86

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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.