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Finding the Fourth Proportional to 405,812.61, 608,712.75 and 139,575.44

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Solution

The fourth proportional to 405,812.61, 608,712.75 and 139,575.44 is: 209,361.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,812.61 : 608,712.75 = 139,575.44 : x
  2. Step 2: Convert to fraction form
    405,812.61/608,712.75 = 139,575.44/x
  3. Step 3: Cross multiply
    405,812.61x = 608,712.75 × 139,575.44
  4. Step 4: Simplify right side
    405,812.61x = 84,961,346,871.30
  5. Step 5: Solve for x
    x = 84,961,346,871.30/405,812.61
  6. Step 6: Final answer
    x = 209,361.03

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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.