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Finding the Fourth Proportional to 28,220.20, 38,942.02 and 15,644.20

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Solution

The fourth proportional to 28,220.20, 38,942.02 and 15,644.20 is: 21,587.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,220.20 : 38,942.02 = 15,644.20 : x
  2. Step 2: Convert to fraction form
    28,220.20/38,942.02 = 15,644.20/x
  3. Step 3: Cross multiply
    28,220.20x = 38,942.02 × 15,644.20
  4. Step 4: Simplify right side
    28,220.20x = 609,216,749.28
  5. Step 5: Solve for x
    x = 609,216,749.28/28,220.20
  6. Step 6: Final answer
    x = 21,587.97

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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.