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Finding the Fourth Proportional to 28,219.96, 38,945.10 and 15,644.44

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Solution

The fourth proportional to 28,219.96, 38,945.10 and 15,644.44 is: 21,590.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,219.96 : 38,945.10 = 15,644.44 : x
  2. Step 2: Convert to fraction form
    28,219.96/38,945.10 = 15,644.44/x
  3. Step 3: Cross multiply
    28,219.96x = 38,945.10 × 15,644.44
  4. Step 4: Simplify right side
    28,219.96x = 609,274,280.24
  5. Step 5: Solve for x
    x = 609,274,280.24/28,219.96
  6. Step 6: Final answer
    x = 21,590.19

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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.