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Finding the Fourth Proportional to 219,630, 303,121.92 and 139,065

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Solution

The fourth proportional to 219,630, 303,121.92 and 139,065 is: 191,930.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,630 : 303,121.92 = 139,065 : x
  2. Step 2: Convert to fraction form
    219,630/303,121.92 = 139,065/x
  3. Step 3: Cross multiply
    219,630x = 303,121.92 × 139,065
  4. Step 4: Simplify right side
    219,630x = 42,153,649,804.80
  5. Step 5: Solve for x
    x = 42,153,649,804.80/219,630
  6. Step 6: Final answer
    x = 191,930.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.