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Finding the Fourth Proportional to 78,858.36, 118,153.89 and 47,628

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Solution

The fourth proportional to 78,858.36, 118,153.89 and 47,628 is: 71,361.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,858.36 : 118,153.89 = 47,628 : x
  2. Step 2: Convert to fraction form
    78,858.36/118,153.89 = 47,628/x
  3. Step 3: Cross multiply
    78,858.36x = 118,153.89 × 47,628
  4. Step 4: Simplify right side
    78,858.36x = 5,627,433,472.92
  5. Step 5: Solve for x
    x = 5,627,433,472.92/78,858.36
  6. Step 6: Final answer
    x = 71,361.28

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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.