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Finding the Fourth Proportional to 411,003, 616,504.50 and 115,515

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Solution

The fourth proportional to 411,003, 616,504.50 and 115,515 is: 173,272.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,003 : 616,504.50 = 115,515 : x
  2. Step 2: Convert to fraction form
    411,003/616,504.50 = 115,515/x
  3. Step 3: Cross multiply
    411,003x = 616,504.50 × 115,515
  4. Step 4: Simplify right side
    411,003x = 71,215,517,317.50
  5. Step 5: Solve for x
    x = 71,215,517,317.50/411,003
  6. Step 6: Final answer
    x = 173,272.50

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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.