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Finding the Fourth Proportional to 103,858.74, 143,157.15 and 81,158.28

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Solution

The fourth proportional to 103,858.74, 143,157.15 and 81,158.28 is: 111,867.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,858.74 : 143,157.15 = 81,158.28 : x
  2. Step 2: Convert to fraction form
    103,858.74/143,157.15 = 81,158.28/x
  3. Step 3: Cross multiply
    103,858.74x = 143,157.15 × 81,158.28
  4. Step 4: Simplify right side
    103,858.74x = 11,618,388,063.70
  5. Step 5: Solve for x
    x = 11,618,388,063.70/103,858.74
  6. Step 6: Final answer
    x = 111,867.22

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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.