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Finding the Fourth Proportional to 139,868.94, 209,466.45 and 87,212.46

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Solution

The fourth proportional to 139,868.94, 209,466.45 and 87,212.46 is: 130,608.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,868.94 : 209,466.45 = 87,212.46 : x
  2. Step 2: Convert to fraction form
    139,868.94/209,466.45 = 87,212.46/x
  3. Step 3: Cross multiply
    139,868.94x = 209,466.45 × 87,212.46
  4. Step 4: Simplify right side
    139,868.94x = 18,268,084,391.97
  5. Step 5: Solve for x
    x = 18,268,084,391.97/139,868.94
  6. Step 6: Final answer
    x = 130,608.59

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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.