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Finding the Fourth Proportional to 21,093.60, 29,108.64 and 12,140.88

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Solution

The fourth proportional to 21,093.60, 29,108.64 and 12,140.88 is: 16,754.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,093.60 : 29,108.64 = 12,140.88 : x
  2. Step 2: Convert to fraction form
    21,093.60/29,108.64 = 12,140.88/x
  3. Step 3: Cross multiply
    21,093.60x = 29,108.64 × 12,140.88
  4. Step 4: Simplify right side
    21,093.60x = 353,404,505.20
  5. Step 5: Solve for x
    x = 353,404,505.20/21,093.60
  6. Step 6: Final answer
    x = 16,754.11

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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.