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Finding the Fourth Proportional to 20,988.91, 28,964.65 and 11,428.65

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Solution

The fourth proportional to 20,988.91, 28,964.65 and 11,428.65 is: 15,771.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.91 : 28,964.65 = 11,428.65 : x
  2. Step 2: Convert to fraction form
    20,988.91/28,964.65 = 11,428.65/x
  3. Step 3: Cross multiply
    20,988.91x = 28,964.65 × 11,428.65
  4. Step 4: Simplify right side
    20,988.91x = 331,026,785.77
  5. Step 5: Solve for x
    x = 331,026,785.77/20,988.91
  6. Step 6: Final answer
    x = 15,771.51

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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.