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Finding the Fourth Proportional to 21,699.68, 29,945.40 and 12,139.58

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Solution

The fourth proportional to 21,699.68, 29,945.40 and 12,139.58 is: 16,752.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,699.68 : 29,945.40 = 12,139.58 : x
  2. Step 2: Convert to fraction form
    21,699.68/29,945.40 = 12,139.58/x
  3. Step 3: Cross multiply
    21,699.68x = 29,945.40 × 12,139.58
  4. Step 4: Simplify right side
    21,699.68x = 363,524,578.93
  5. Step 5: Solve for x
    x = 363,524,578.93/21,699.68
  6. Step 6: Final answer
    x = 16,752.53

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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.