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Finding the Fourth Proportional to 20,878.97, 28,813.08 and 12,495.47

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Solution

The fourth proportional to 20,878.97, 28,813.08 and 12,495.47 is: 17,243.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.97 : 28,813.08 = 12,495.47 : x
  2. Step 2: Convert to fraction form
    20,878.97/28,813.08 = 12,495.47/x
  3. Step 3: Cross multiply
    20,878.97x = 28,813.08 × 12,495.47
  4. Step 4: Simplify right side
    20,878.97x = 360,032,832.68
  5. Step 5: Solve for x
    x = 360,032,832.68/20,878.97
  6. Step 6: Final answer
    x = 17,243.81

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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.