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Finding the Fourth Proportional to 20,564.85, 28,379.55 and 11,133.39

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Solution

The fourth proportional to 20,564.85, 28,379.55 and 11,133.39 is: 15,364.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,564.85 : 28,379.55 = 11,133.39 : x
  2. Step 2: Convert to fraction form
    20,564.85/28,379.55 = 11,133.39/x
  3. Step 3: Cross multiply
    20,564.85x = 28,379.55 × 11,133.39
  4. Step 4: Simplify right side
    20,564.85x = 315,960,598.17
  5. Step 5: Solve for x
    x = 315,960,598.17/20,564.85
  6. Step 6: Final answer
    x = 15,364.11

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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.