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Finding the Fourth Proportional to 21,651.84, 29,878.80 and 12,219.60

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Solution

The fourth proportional to 21,651.84, 29,878.80 and 12,219.60 is: 16,862.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,651.84 : 29,878.80 = 12,219.60 : x
  2. Step 2: Convert to fraction form
    21,651.84/29,878.80 = 12,219.60/x
  3. Step 3: Cross multiply
    21,651.84x = 29,878.80 × 12,219.60
  4. Step 4: Simplify right side
    21,651.84x = 365,106,984.48
  5. Step 5: Solve for x
    x = 365,106,984.48/21,651.84
  6. Step 6: Final answer
    x = 16,862.63

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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.