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Finding the Fourth Proportional to 28,544.40, 42,865.20 and 21,157.20

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Solution

The fourth proportional to 28,544.40, 42,865.20 and 21,157.20 is: 31,771.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,544.40 : 42,865.20 = 21,157.20 : x
  2. Step 2: Convert to fraction form
    28,544.40/42,865.20 = 21,157.20/x
  3. Step 3: Cross multiply
    28,544.40x = 42,865.20 × 21,157.20
  4. Step 4: Simplify right side
    28,544.40x = 906,907,609.44
  5. Step 5: Solve for x
    x = 906,907,609.44/28,544.40
  6. Step 6: Final answer
    x = 31,771.82

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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.