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Finding the Fourth Proportional to 188,515.78, 260,152.60 and 103,638.30

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Solution

The fourth proportional to 188,515.78, 260,152.60 and 103,638.30 is: 143,021.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    188,515.78 : 260,152.60 = 103,638.30 : x
  2. Step 2: Convert to fraction form
    188,515.78/260,152.60 = 103,638.30/x
  3. Step 3: Cross multiply
    188,515.78x = 260,152.60 × 103,638.30
  4. Step 4: Simplify right side
    188,515.78x = 26,961,773,204.58
  5. Step 5: Solve for x
    x = 26,961,773,204.58/188,515.78
  6. Step 6: Final answer
    x = 143,021.31

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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.