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Finding the Fourth Proportional to 112,991.55, 155,930.16 and 65,249.07

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Solution

The fourth proportional to 112,991.55, 155,930.16 and 65,249.07 is: 90,044.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,991.55 : 155,930.16 = 65,249.07 : x
  2. Step 2: Convert to fraction form
    112,991.55/155,930.16 = 65,249.07/x
  3. Step 3: Cross multiply
    112,991.55x = 155,930.16 × 65,249.07
  4. Step 4: Simplify right side
    112,991.55x = 10,174,297,924.95
  5. Step 5: Solve for x
    x = 10,174,297,924.95/112,991.55
  6. Step 6: Final answer
    x = 90,044.77

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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.