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Finding the Fourth Proportional to 20,937.78, 28,894.23 and 11,506.95

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Solution

The fourth proportional to 20,937.78, 28,894.23 and 11,506.95 is: 15,879.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,937.78 : 28,894.23 = 11,506.95 : x
  2. Step 2: Convert to fraction form
    20,937.78/28,894.23 = 11,506.95/x
  3. Step 3: Cross multiply
    20,937.78x = 28,894.23 × 11,506.95
  4. Step 4: Simplify right side
    20,937.78x = 332,484,459.90
  5. Step 5: Solve for x
    x = 332,484,459.90/20,937.78
  6. Step 6: Final answer
    x = 15,879.64

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.