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Finding the Fourth Proportional to 21,307.79, 29,404.95 and 11,748.02

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Solution

The fourth proportional to 21,307.79, 29,404.95 and 11,748.02 is: 16,212.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,307.79 : 29,404.95 = 11,748.02 : x
  2. Step 2: Convert to fraction form
    21,307.79/29,404.95 = 11,748.02/x
  3. Step 3: Cross multiply
    21,307.79x = 29,404.95 × 11,748.02
  4. Step 4: Simplify right side
    21,307.79x = 345,449,940.70
  5. Step 5: Solve for x
    x = 345,449,940.70/21,307.79
  6. Step 6: Final answer
    x = 16,212.38

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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.