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Finding the Fourth Proportional to 28,245.72, 38,978.62 and 15,670.20

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Solution

The fourth proportional to 28,245.72, 38,978.62 and 15,670.20 is: 21,624.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,245.72 : 38,978.62 = 15,670.20 : x
  2. Step 2: Convert to fraction form
    28,245.72/38,978.62 = 15,670.20/x
  3. Step 3: Cross multiply
    28,245.72x = 38,978.62 × 15,670.20
  4. Step 4: Simplify right side
    28,245.72x = 610,802,771.12
  5. Step 5: Solve for x
    x = 610,802,771.12/28,245.72
  6. Step 6: Final answer
    x = 21,624.61

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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.