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Finding the Fourth Proportional to 20,578.93, 28,398.93 and 11,147.50

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Solution

The fourth proportional to 20,578.93, 28,398.93 and 11,147.50 is: 15,383.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,578.93 : 28,398.93 = 11,147.50 : x
  2. Step 2: Convert to fraction form
    20,578.93/28,398.93 = 11,147.50/x
  3. Step 3: Cross multiply
    20,578.93x = 28,398.93 × 11,147.50
  4. Step 4: Simplify right side
    20,578.93x = 316,577,072.18
  5. Step 5: Solve for x
    x = 316,577,072.18/20,578.93
  6. Step 6: Final answer
    x = 15,383.55

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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.