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Finding the Fourth Proportional to 100,905.75, 139,249.97 and 58,488.89

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Solution

The fourth proportional to 100,905.75, 139,249.97 and 58,488.89 is: 80,714.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,905.75 : 139,249.97 = 58,488.89 : x
  2. Step 2: Convert to fraction form
    100,905.75/139,249.97 = 58,488.89/x
  3. Step 3: Cross multiply
    100,905.75x = 139,249.97 × 58,488.89
  4. Step 4: Simplify right side
    100,905.75x = 8,144,575,408.47
  5. Step 5: Solve for x
    x = 8,144,575,408.47/100,905.75
  6. Step 6: Final answer
    x = 80,714.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.