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Finding the Fourth Proportional to 126,705.15, 174,850.88 and 72,990

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Solution

The fourth proportional to 126,705.15, 174,850.88 and 72,990 is: 100,724.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,705.15 : 174,850.88 = 72,990 : x
  2. Step 2: Convert to fraction form
    126,705.15/174,850.88 = 72,990/x
  3. Step 3: Cross multiply
    126,705.15x = 174,850.88 × 72,990
  4. Step 4: Simplify right side
    126,705.15x = 12,762,365,366.25
  5. Step 5: Solve for x
    x = 12,762,365,366.25/126,705.15
  6. Step 6: Final answer
    x = 100,724.91

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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.