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Finding the Fourth Proportional to 405,379.26, 608,081.25 and 139,135.98

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Solution

The fourth proportional to 405,379.26, 608,081.25 and 139,135.98 is: 208,708.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,379.26 : 608,081.25 = 139,135.98 : x
  2. Step 2: Convert to fraction form
    405,379.26/608,081.25 = 139,135.98/x
  3. Step 3: Cross multiply
    405,379.26x = 608,081.25 × 139,135.98
  4. Step 4: Simplify right side
    405,379.26x = 84,605,980,638.38
  5. Step 5: Solve for x
    x = 84,605,980,638.38/405,379.26
  6. Step 6: Final answer
    x = 208,708.21

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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.