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Finding the Fourth Proportional to 21,850.70, 30,157.90 and 12,897.68

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Solution

The fourth proportional to 21,850.70, 30,157.90 and 12,897.68 is: 17,801.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,850.70 : 30,157.90 = 12,897.68 : x
  2. Step 2: Convert to fraction form
    21,850.70/30,157.90 = 12,897.68/x
  3. Step 3: Cross multiply
    21,850.70x = 30,157.90 × 12,897.68
  4. Step 4: Simplify right side
    21,850.70x = 388,966,943.67
  5. Step 5: Solve for x
    x = 388,966,943.67/21,850.70
  6. Step 6: Final answer
    x = 17,801.12

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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.