Home / 78,390.23-118,108.31-70,902.41

Finding the Fourth Proportional to 78,390.23, 118,108.31 and 70,902.41

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Solution

The fourth proportional to 78,390.23, 118,108.31 and 70,902.41 is: 106,826.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390.23 : 118,108.31 = 70,902.41 : x
  2. Step 2: Convert to fraction form
    78,390.23/118,108.31 = 70,902.41/x
  3. Step 3: Cross multiply
    78,390.23x = 118,108.31 × 70,902.41
  4. Step 4: Simplify right side
    78,390.23x = 8,374,162,874.97
  5. Step 5: Solve for x
    x = 8,374,162,874.97/78,390.23
  6. Step 6: Final answer
    x = 106,826.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.