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Finding the Fourth Proportional to 21,647.84, 29,874.60 and 12,696.08

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Solution

The fourth proportional to 21,647.84, 29,874.60 and 12,696.08 is: 17,520.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,647.84 : 29,874.60 = 12,696.08 : x
  2. Step 2: Convert to fraction form
    21,647.84/29,874.60 = 12,696.08/x
  3. Step 3: Cross multiply
    21,647.84x = 29,874.60 × 12,696.08
  4. Step 4: Simplify right side
    21,647.84x = 379,290,311.57
  5. Step 5: Solve for x
    x = 379,290,311.57/21,647.84
  6. Step 6: Final answer
    x = 17,520.93

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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.