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Finding the Fourth Proportional to 78,890.76, 118,265.81 and 28,959.39

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Solution

The fourth proportional to 78,890.76, 118,265.81 and 28,959.39 is: 43,413.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,890.76 : 118,265.81 = 28,959.39 : x
  2. Step 2: Convert to fraction form
    78,890.76/118,265.81 = 28,959.39/x
  3. Step 3: Cross multiply
    78,890.76x = 118,265.81 × 28,959.39
  4. Step 4: Simplify right side
    78,890.76x = 3,424,905,570.66
  5. Step 5: Solve for x
    x = 3,424,905,570.66/78,890.76
  6. Step 6: Final answer
    x = 43,413.27

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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.