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Finding the Fourth Proportional to 21,308.68, 29,408.16 and 12,813.56

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Solution

The fourth proportional to 21,308.68, 29,408.16 and 12,813.56 is: 17,684.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,308.68 : 29,408.16 = 12,813.56 : x
  2. Step 2: Convert to fraction form
    21,308.68/29,408.16 = 12,813.56/x
  3. Step 3: Cross multiply
    21,308.68x = 29,408.16 × 12,813.56
  4. Step 4: Simplify right side
    21,308.68x = 376,823,222.65
  5. Step 5: Solve for x
    x = 376,823,222.65/21,308.68
  6. Step 6: Final answer
    x = 17,684.02

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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.