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Finding the Fourth Proportional to 78,689.58, 118,017.81 and 28,793.22

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Solution

The fourth proportional to 78,689.58, 118,017.81 and 28,793.22 is: 43,183.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,689.58 : 118,017.81 = 28,793.22 : x
  2. Step 2: Convert to fraction form
    78,689.58/118,017.81 = 28,793.22/x
  3. Step 3: Cross multiply
    78,689.58x = 118,017.81 × 28,793.22
  4. Step 4: Simplify right side
    78,689.58x = 3,398,112,767.25
  5. Step 5: Solve for x
    x = 3,398,112,767.25/78,689.58
  6. Step 6: Final answer
    x = 43,183.77

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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.