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Finding the Fourth Proportional to 21,887.64, 30,201.90 and 12,455.16

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Solution

The fourth proportional to 21,887.64, 30,201.90 and 12,455.16 is: 17,186.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,887.64 : 30,201.90 = 12,455.16 : x
  2. Step 2: Convert to fraction form
    21,887.64/30,201.90 = 12,455.16/x
  3. Step 3: Cross multiply
    21,887.64x = 30,201.90 × 12,455.16
  4. Step 4: Simplify right side
    21,887.64x = 376,169,496.80
  5. Step 5: Solve for x
    x = 376,169,496.80/21,887.64
  6. Step 6: Final answer
    x = 17,186.39

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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.