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Finding the Fourth Proportional to 21,198.86, 29,253.86 and 12,705.79

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Solution

The fourth proportional to 21,198.86, 29,253.86 and 12,705.79 is: 17,533.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,198.86 : 29,253.86 = 12,705.79 : x
  2. Step 2: Convert to fraction form
    21,198.86/29,253.86 = 12,705.79/x
  3. Step 3: Cross multiply
    21,198.86x = 29,253.86 × 12,705.79
  4. Step 4: Simplify right side
    21,198.86x = 371,693,285.41
  5. Step 5: Solve for x
    x = 371,693,285.41/21,198.86
  6. Step 6: Final answer
    x = 17,533.64

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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.