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Finding the Fourth Proportional to 100,842.90, 139,157.93 and 55,512.03

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Solution

The fourth proportional to 100,842.90, 139,157.93 and 55,512.03 is: 76,603.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,842.90 : 139,157.93 = 55,512.03 : x
  2. Step 2: Convert to fraction form
    100,842.90/139,157.93 = 55,512.03/x
  3. Step 3: Cross multiply
    100,842.90x = 139,157.93 × 55,512.03
  4. Step 4: Simplify right side
    100,842.90x = 7,724,938,907.34
  5. Step 5: Solve for x
    x = 7,724,938,907.34/100,842.90
  6. Step 6: Final answer
    x = 76,603.70

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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.