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Finding the Fourth Proportional to 405,321.72, 607,994.80 and 139,078.36

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Solution

The fourth proportional to 405,321.72, 607,994.80 and 139,078.36 is: 208,621.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,321.72 : 607,994.80 = 139,078.36 : x
  2. Step 2: Convert to fraction form
    405,321.72/607,994.80 = 139,078.36/x
  3. Step 3: Cross multiply
    405,321.72x = 607,994.80 × 139,078.36
  4. Step 4: Simplify right side
    405,321.72x = 84,558,919,672.53
  5. Step 5: Solve for x
    x = 84,558,919,672.53/405,321.72
  6. Step 6: Final answer
    x = 208,621.73

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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.