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Finding the Fourth Proportional to 28,662.80, 42,994.20 and 21,664.40

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Solution

The fourth proportional to 28,662.80, 42,994.20 and 21,664.40 is: 32,496.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,662.80 : 42,994.20 = 21,664.40 : x
  2. Step 2: Convert to fraction form
    28,662.80/42,994.20 = 21,664.40/x
  3. Step 3: Cross multiply
    28,662.80x = 42,994.20 × 21,664.40
  4. Step 4: Simplify right side
    28,662.80x = 931,443,546.48
  5. Step 5: Solve for x
    x = 931,443,546.48/28,662.80
  6. Step 6: Final answer
    x = 32,496.60

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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.