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Finding the Fourth Proportional to 19,511.68, 26,926.68 and 11,128

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Solution

The fourth proportional to 19,511.68, 26,926.68 and 11,128 is: 15,356.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,511.68 : 26,926.68 = 11,128 : x
  2. Step 2: Convert to fraction form
    19,511.68/26,926.68 = 11,128/x
  3. Step 3: Cross multiply
    19,511.68x = 26,926.68 × 11,128
  4. Step 4: Simplify right side
    19,511.68x = 299,640,095.04
  5. Step 5: Solve for x
    x = 299,640,095.04/19,511.68
  6. Step 6: Final answer
    x = 15,356.96

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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.