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Finding the Fourth Proportional to 21,181.30, 29,230.64 and 12,683.80

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Solution

The fourth proportional to 21,181.30, 29,230.64 and 12,683.80 is: 17,503.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,181.30 : 29,230.64 = 12,683.80 : x
  2. Step 2: Convert to fraction form
    21,181.30/29,230.64 = 12,683.80/x
  3. Step 3: Cross multiply
    21,181.30x = 29,230.64 × 12,683.80
  4. Step 4: Simplify right side
    21,181.30x = 370,755,591.63
  5. Step 5: Solve for x
    x = 370,755,591.63/21,181.30
  6. Step 6: Final answer
    x = 17,503.91

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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.