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Finding the Fourth Proportional to 405,377.76, 608,079 and 139,134.48

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Solution

The fourth proportional to 405,377.76, 608,079 and 139,134.48 is: 208,705.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,377.76 : 608,079 = 139,134.48 : x
  2. Step 2: Convert to fraction form
    405,377.76/608,079 = 139,134.48/x
  3. Step 3: Cross multiply
    405,377.76x = 608,079 × 139,134.48
  4. Step 4: Simplify right side
    405,377.76x = 84,604,755,463.92
  5. Step 5: Solve for x
    x = 84,604,755,463.92/405,377.76
  6. Step 6: Final answer
    x = 208,705.96

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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.