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Finding the Fourth Proportional to 100,918.74, 139,236.98 and 58,469.06

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Solution

The fourth proportional to 100,918.74, 139,236.98 and 58,469.06 is: 80,669.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,918.74 : 139,236.98 = 58,469.06 : x
  2. Step 2: Convert to fraction form
    100,918.74/139,236.98 = 58,469.06/x
  3. Step 3: Cross multiply
    100,918.74x = 139,236.98 × 58,469.06
  4. Step 4: Simplify right side
    100,918.74x = 8,141,055,337.84
  5. Step 5: Solve for x
    x = 8,141,055,337.84/100,918.74
  6. Step 6: Final answer
    x = 80,669.41

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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.