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Finding the Fourth Proportional to 20,651.58, 28,499.20 and 11,220.14

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Solution

The fourth proportional to 20,651.58, 28,499.20 and 11,220.14 is: 15,483.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,651.58 : 28,499.20 = 11,220.14 : x
  2. Step 2: Convert to fraction form
    20,651.58/28,499.20 = 11,220.14/x
  3. Step 3: Cross multiply
    20,651.58x = 28,499.20 × 11,220.14
  4. Step 4: Simplify right side
    20,651.58x = 319,765,013.89
  5. Step 5: Solve for x
    x = 319,765,013.89/20,651.58
  6. Step 6: Final answer
    x = 15,483.80

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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.