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Finding the Fourth Proportional to 20,605.78, 28,435.95 and 11,174.32

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Solution

The fourth proportional to 20,605.78, 28,435.95 and 11,174.32 is: 15,420.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,605.78 : 28,435.95 = 11,174.32 : x
  2. Step 2: Convert to fraction form
    20,605.78/28,435.95 = 11,174.32/x
  3. Step 3: Cross multiply
    20,605.78x = 28,435.95 × 11,174.32
  4. Step 4: Simplify right side
    20,605.78x = 317,752,404.80
  5. Step 5: Solve for x
    x = 317,752,404.80/20,605.78
  6. Step 6: Final answer
    x = 15,420.55

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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.