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Finding the Fourth Proportional to 208,172.12, 287,200.60 and 136,649.32

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Solution

The fourth proportional to 208,172.12, 287,200.60 and 136,649.32 is: 188,525.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,172.12 : 287,200.60 = 136,649.32 : x
  2. Step 2: Convert to fraction form
    208,172.12/287,200.60 = 136,649.32/x
  3. Step 3: Cross multiply
    208,172.12x = 287,200.60 × 136,649.32
  4. Step 4: Simplify right side
    208,172.12x = 39,245,766,693.59
  5. Step 5: Solve for x
    x = 39,245,766,693.59/208,172.12
  6. Step 6: Final answer
    x = 188,525.57

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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.