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Finding the Fourth Proportional to 405,893.88, 608,834.49 and 139,656.72

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Solution

The fourth proportional to 405,893.88, 608,834.49 and 139,656.72 is: 209,482.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,893.88 : 608,834.49 = 139,656.72 : x
  2. Step 2: Convert to fraction form
    405,893.88/608,834.49 = 139,656.72/x
  3. Step 3: Cross multiply
    405,893.88x = 608,834.49 × 139,656.72
  4. Step 4: Simplify right side
    405,893.88x = 85,027,827,896.27
  5. Step 5: Solve for x
    x = 85,027,827,896.27/405,893.88
  6. Step 6: Final answer
    x = 209,482.90

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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.