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Finding the Fourth Proportional to 438,699.69, 658,072.89 and 139,203.41

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Solution

The fourth proportional to 438,699.69, 658,072.89 and 139,203.41 is: 208,812.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,699.69 : 658,072.89 = 139,203.41 : x
  2. Step 2: Convert to fraction form
    438,699.69/658,072.89 = 139,203.41/x
  3. Step 3: Cross multiply
    438,699.69x = 658,072.89 × 139,203.41
  4. Step 4: Simplify right side
    438,699.69x = 91,605,987,026.19
  5. Step 5: Solve for x
    x = 91,605,987,026.19/438,699.69
  6. Step 6: Final answer
    x = 208,812.52

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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.