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Finding the Fourth Proportional to 20,643.99, 28,488.48 and 11,691.47

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Solution

The fourth proportional to 20,643.99, 28,488.48 and 11,691.47 is: 16,134.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,643.99 : 28,488.48 = 11,691.47 : x
  2. Step 2: Convert to fraction form
    20,643.99/28,488.48 = 11,691.47/x
  3. Step 3: Cross multiply
    20,643.99x = 28,488.48 × 11,691.47
  4. Step 4: Simplify right side
    20,643.99x = 333,072,066.82
  5. Step 5: Solve for x
    x = 333,072,066.82/20,643.99
  6. Step 6: Final answer
    x = 16,134.09

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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.