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Finding the Fourth Proportional to 20,902.77, 28,840.71 and 11,828.28

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Solution

The fourth proportional to 20,902.77, 28,840.71 and 11,828.28 is: 16,320.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,902.77 : 28,840.71 = 11,828.28 : x
  2. Step 2: Convert to fraction form
    20,902.77/28,840.71 = 11,828.28/x
  3. Step 3: Cross multiply
    20,902.77x = 28,840.71 × 11,828.28
  4. Step 4: Simplify right side
    20,902.77x = 341,135,993.28
  5. Step 5: Solve for x
    x = 341,135,993.28/20,902.77
  6. Step 6: Final answer
    x = 16,320.13

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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.