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Finding the Fourth Proportional to 78,878.69, 118,247.87 and 28,947.36

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Solution

The fourth proportional to 78,878.69, 118,247.87 and 28,947.36 is: 43,395.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,878.69 : 118,247.87 = 28,947.36 : x
  2. Step 2: Convert to fraction form
    78,878.69/118,247.87 = 28,947.36/x
  3. Step 3: Cross multiply
    78,878.69x = 118,247.87 × 28,947.36
  4. Step 4: Simplify right side
    78,878.69x = 3,422,963,734.49
  5. Step 5: Solve for x
    x = 3,422,963,734.49/78,878.69
  6. Step 6: Final answer
    x = 43,395.29

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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.