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Finding the Fourth Proportional to 21,897, 30,275.46 and 20,917.80

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Solution

The fourth proportional to 21,897, 30,275.46 and 20,917.80 is: 28,921.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,897 : 30,275.46 = 20,917.80 : x
  2. Step 2: Convert to fraction form
    21,897/30,275.46 = 20,917.80/x
  3. Step 3: Cross multiply
    21,897x = 30,275.46 × 20,917.80
  4. Step 4: Simplify right side
    21,897x = 633,296,017.19
  5. Step 5: Solve for x
    x = 633,296,017.19/21,897
  6. Step 6: Final answer
    x = 28,921.59

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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.