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Finding the Fourth Proportional to 20,950.77, 28,918.20 and 12,458.88

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Solution

The fourth proportional to 20,950.77, 28,918.20 and 12,458.88 is: 17,196.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,950.77 : 28,918.20 = 12,458.88 : x
  2. Step 2: Convert to fraction form
    20,950.77/28,918.20 = 12,458.88/x
  3. Step 3: Cross multiply
    20,950.77x = 28,918.20 × 12,458.88
  4. Step 4: Simplify right side
    20,950.77x = 360,288,383.62
  5. Step 5: Solve for x
    x = 360,288,383.62/20,950.77
  6. Step 6: Final answer
    x = 17,196.90

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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.