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Finding the Fourth Proportional to 21,893.28, 30,143.28 and 19,897.68

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Solution

The fourth proportional to 21,893.28, 30,143.28 and 19,897.68 is: 27,395.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,893.28 : 30,143.28 = 19,897.68 : x
  2. Step 2: Convert to fraction form
    21,893.28/30,143.28 = 19,897.68/x
  3. Step 3: Cross multiply
    21,893.28x = 30,143.28 × 19,897.68
  4. Step 4: Simplify right side
    21,893.28x = 599,781,339.59
  5. Step 5: Solve for x
    x = 599,781,339.59/21,893.28
  6. Step 6: Final answer
    x = 27,395.68

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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.