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Finding the Fourth Proportional to 100,911.38, 139,257.74 and 58,494.51

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Solution

The fourth proportional to 100,911.38, 139,257.74 and 58,494.51 is: 80,722.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,911.38 : 139,257.74 = 58,494.51 : x
  2. Step 2: Convert to fraction form
    100,911.38/139,257.74 = 58,494.51/x
  3. Step 3: Cross multiply
    100,911.38x = 139,257.74 × 58,494.51
  4. Step 4: Simplify right side
    100,911.38x = 8,145,812,972.53
  5. Step 5: Solve for x
    x = 8,145,812,972.53/100,911.38
  6. Step 6: Final answer
    x = 80,722.45

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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.