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Finding the Fourth Proportional to 20,878.94, 28,812.90 and 11,448.12

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Solution

The fourth proportional to 20,878.94, 28,812.90 and 11,448.12 is: 15,798.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,878.94 : 28,812.90 = 11,448.12 : x
  2. Step 2: Convert to fraction form
    20,878.94/28,812.90 = 11,448.12/x
  3. Step 3: Cross multiply
    20,878.94x = 28,812.90 × 11,448.12
  4. Step 4: Simplify right side
    20,878.94x = 329,853,536.75
  5. Step 5: Solve for x
    x = 329,853,536.75/20,878.94
  6. Step 6: Final answer
    x = 15,798.39

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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.