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Finding the Fourth Proportional to 20,319.78, 28,042.78 and 11,370.16

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Solution

The fourth proportional to 20,319.78, 28,042.78 and 11,370.16 is: 15,691.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,319.78 : 28,042.78 = 11,370.16 : x
  2. Step 2: Convert to fraction form
    20,319.78/28,042.78 = 11,370.16/x
  3. Step 3: Cross multiply
    20,319.78x = 28,042.78 × 11,370.16
  4. Step 4: Simplify right side
    20,319.78x = 318,850,895.44
  5. Step 5: Solve for x
    x = 318,850,895.44/20,319.78
  6. Step 6: Final answer
    x = 15,691.65

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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.