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Finding the Fourth Proportional to 20,308.71, 28,028.63 and 11,356.71

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Solution

The fourth proportional to 20,308.71, 28,028.63 and 11,356.71 is: 15,673.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,308.71 : 28,028.63 = 11,356.71 : x
  2. Step 2: Convert to fraction form
    20,308.71/28,028.63 = 11,356.71/x
  3. Step 3: Cross multiply
    20,308.71x = 28,028.63 × 11,356.71
  4. Step 4: Simplify right side
    20,308.71x = 318,313,039.67
  5. Step 5: Solve for x
    x = 318,313,039.67/20,308.71
  6. Step 6: Final answer
    x = 15,673.72

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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.