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Finding the Fourth Proportional to 455,055.76, 682,358.88 and 139,436.56

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Solution

The fourth proportional to 455,055.76, 682,358.88 and 139,436.56 is: 209,085.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,055.76 : 682,358.88 = 139,436.56 : x
  2. Step 2: Convert to fraction form
    455,055.76/682,358.88 = 139,436.56/x
  3. Step 3: Cross multiply
    455,055.76x = 682,358.88 × 139,436.56
  4. Step 4: Simplify right side
    455,055.76x = 95,145,774,912.65
  5. Step 5: Solve for x
    x = 95,145,774,912.65/455,055.76
  6. Step 6: Final answer
    x = 209,085.97

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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.