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Finding the Fourth Proportional to 28,480.60, 42,721.14 and 12,879.88

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Solution

The fourth proportional to 28,480.60, 42,721.14 and 12,879.88 is: 19,319.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,480.60 : 42,721.14 = 12,879.88 : x
  2. Step 2: Convert to fraction form
    28,480.60/42,721.14 = 12,879.88/x
  3. Step 3: Cross multiply
    28,480.60x = 42,721.14 × 12,879.88
  4. Step 4: Simplify right side
    28,480.60x = 550,243,156.66
  5. Step 5: Solve for x
    x = 550,243,156.66/28,480.60
  6. Step 6: Final answer
    x = 19,319.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.