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Finding the Fourth Proportional to 405,814.11, 608,715 and 139,576.94

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Solution

The fourth proportional to 405,814.11, 608,715 and 139,576.94 is: 209,363.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,814.11 : 608,715 = 139,576.94 : x
  2. Step 2: Convert to fraction form
    405,814.11/608,715 = 139,576.94/x
  3. Step 3: Cross multiply
    405,814.11x = 608,715 × 139,576.94
  4. Step 4: Simplify right side
    405,814.11x = 84,962,573,988.53
  5. Step 5: Solve for x
    x = 84,962,573,988.53/405,814.11
  6. Step 6: Final answer
    x = 209,363.28

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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.