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Finding the Fourth Proportional to 28,063.70, 38,728.14 and 15,316.98

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Solution

The fourth proportional to 28,063.70, 38,728.14 and 15,316.98 is: 21,137.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,063.70 : 38,728.14 = 15,316.98 : x
  2. Step 2: Convert to fraction form
    28,063.70/38,728.14 = 15,316.98/x
  3. Step 3: Cross multiply
    28,063.70x = 38,728.14 × 15,316.98
  4. Step 4: Simplify right side
    28,063.70x = 593,198,145.82
  5. Step 5: Solve for x
    x = 593,198,145.82/28,063.70
  6. Step 6: Final answer
    x = 21,137.56

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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.