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Finding the Fourth Proportional to 21,197.20, 31,810.20 and 11,837.20

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Solution

The fourth proportional to 21,197.20, 31,810.20 and 11,837.20 is: 17,763.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,197.20 : 31,810.20 = 11,837.20 : x
  2. Step 2: Convert to fraction form
    21,197.20/31,810.20 = 11,837.20/x
  3. Step 3: Cross multiply
    21,197.20x = 31,810.20 × 11,837.20
  4. Step 4: Simplify right side
    21,197.20x = 376,543,699.44
  5. Step 5: Solve for x
    x = 376,543,699.44/21,197.20
  6. Step 6: Final answer
    x = 17,763.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.