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Finding the Fourth Proportional to 28,245.07, 38,978.92 and 15,498.80

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Solution

The fourth proportional to 28,245.07, 38,978.92 and 15,498.80 is: 21,388.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,245.07 : 38,978.92 = 15,498.80 : x
  2. Step 2: Convert to fraction form
    28,245.07/38,978.92 = 15,498.80/x
  3. Step 3: Cross multiply
    28,245.07x = 38,978.92 × 15,498.80
  4. Step 4: Simplify right side
    28,245.07x = 604,126,485.30
  5. Step 5: Solve for x
    x = 604,126,485.30/28,245.07
  6. Step 6: Final answer
    x = 21,388.74

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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.