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Finding the Fourth Proportional to 100,818.90, 139,128.96 and 55,495.92

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Solution

The fourth proportional to 100,818.90, 139,128.96 and 55,495.92 is: 76,583.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,818.90 : 139,128.96 = 55,495.92 : x
  2. Step 2: Convert to fraction form
    100,818.90/139,128.96 = 55,495.92/x
  3. Step 3: Cross multiply
    100,818.90x = 139,128.96 × 55,495.92
  4. Step 4: Simplify right side
    100,818.90x = 7,721,089,633.84
  5. Step 5: Solve for x
    x = 7,721,089,633.84/100,818.90
  6. Step 6: Final answer
    x = 76,583.75

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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.