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Finding the Fourth Proportional to 21,490.80, 32,236.20 and 12,274.80

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Solution

The fourth proportional to 21,490.80, 32,236.20 and 12,274.80 is: 18,412.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,490.80 : 32,236.20 = 12,274.80 : x
  2. Step 2: Convert to fraction form
    21,490.80/32,236.20 = 12,274.80/x
  3. Step 3: Cross multiply
    21,490.80x = 32,236.20 × 12,274.80
  4. Step 4: Simplify right side
    21,490.80x = 395,692,907.76
  5. Step 5: Solve for x
    x = 395,692,907.76/21,490.80
  6. Step 6: Final answer
    x = 18,412.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.