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Finding the Fourth Proportional to 20,873.71, 28,802.59 and 11,919.31

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Solution

The fourth proportional to 20,873.71, 28,802.59 and 11,919.31 is: 16,446.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,873.71 : 28,802.59 = 11,919.31 : x
  2. Step 2: Convert to fraction form
    20,873.71/28,802.59 = 11,919.31/x
  3. Step 3: Cross multiply
    20,873.71x = 28,802.59 × 11,919.31
  4. Step 4: Simplify right side
    20,873.71x = 343,306,978.22
  5. Step 5: Solve for x
    x = 343,306,978.22/20,873.71
  6. Step 6: Final answer
    x = 16,446.86

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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.