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Finding the Fourth Proportional to 100,855.78, 139,169.01 and 58,406.02

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Solution

The fourth proportional to 100,855.78, 139,169.01 and 58,406.02 is: 80,593.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,855.78 : 139,169.01 = 58,406.02 : x
  2. Step 2: Convert to fraction form
    100,855.78/139,169.01 = 58,406.02/x
  3. Step 3: Cross multiply
    100,855.78x = 139,169.01 × 58,406.02
  4. Step 4: Simplify right side
    100,855.78x = 8,128,307,981.44
  5. Step 5: Solve for x
    x = 8,128,307,981.44/100,855.78
  6. Step 6: Final answer
    x = 80,593.38

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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.