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Finding the Fourth Proportional to 20,696.64, 28,561.24 and 11,265

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Solution

The fourth proportional to 20,696.64, 28,561.24 and 11,265 is: 15,545.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,696.64 : 28,561.24 = 11,265 : x
  2. Step 2: Convert to fraction form
    20,696.64/28,561.24 = 11,265/x
  3. Step 3: Cross multiply
    20,696.64x = 28,561.24 × 11,265
  4. Step 4: Simplify right side
    20,696.64x = 321,742,368.60
  5. Step 5: Solve for x
    x = 321,742,368.60/20,696.64
  6. Step 6: Final answer
    x = 15,545.63

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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.