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Finding the Fourth Proportional to 28,671.36, 42,976.80 and 13,099.20

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Solution

The fourth proportional to 28,671.36, 42,976.80 and 13,099.20 is: 19,634.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,671.36 : 42,976.80 = 13,099.20 : x
  2. Step 2: Convert to fraction form
    28,671.36/42,976.80 = 13,099.20/x
  3. Step 3: Cross multiply
    28,671.36x = 42,976.80 × 13,099.20
  4. Step 4: Simplify right side
    28,671.36x = 562,961,698.56
  5. Step 5: Solve for x
    x = 562,961,698.56/28,671.36
  6. Step 6: Final answer
    x = 19,634.98

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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.