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Finding the Fourth Proportional to 21,891.51, 30,144.03 and 18,348.57

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Solution

The fourth proportional to 21,891.51, 30,144.03 and 18,348.57 is: 25,265.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891.51 : 30,144.03 = 18,348.57 : x
  2. Step 2: Convert to fraction form
    21,891.51/30,144.03 = 18,348.57/x
  3. Step 3: Cross multiply
    21,891.51x = 30,144.03 × 18,348.57
  4. Step 4: Simplify right side
    21,891.51x = 553,099,844.54
  5. Step 5: Solve for x
    x = 553,099,844.54/21,891.51
  6. Step 6: Final answer
    x = 25,265.50

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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.