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Finding the Fourth Proportional to 100,571.76, 138,808.52 and 66,580.88

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Solution

The fourth proportional to 100,571.76, 138,808.52 and 66,580.88 is: 91,894.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,571.76 : 138,808.52 = 66,580.88 : x
  2. Step 2: Convert to fraction form
    100,571.76/138,808.52 = 66,580.88/x
  3. Step 3: Cross multiply
    100,571.76x = 138,808.52 × 66,580.88
  4. Step 4: Simplify right side
    100,571.76x = 9,241,993,413.10
  5. Step 5: Solve for x
    x = 9,241,993,413.10/100,571.76
  6. Step 6: Final answer
    x = 91,894.52

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1.5x scale

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.