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Finding the Fourth Proportional to 21,375.70, 29,489.84 and 14,209.08

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Solution

The fourth proportional to 21,375.70, 29,489.84 and 14,209.08 is: 19,602.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,375.70 : 29,489.84 = 14,209.08 : x
  2. Step 2: Convert to fraction form
    21,375.70/29,489.84 = 14,209.08/x
  3. Step 3: Cross multiply
    21,375.70x = 29,489.84 × 14,209.08
  4. Step 4: Simplify right side
    21,375.70x = 419,023,495.75
  5. Step 5: Solve for x
    x = 419,023,495.75/21,375.70
  6. Step 6: Final answer
    x = 19,602.80

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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.