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Finding the Fourth Proportional to 128,672.82, 177,575.56 and 71,310.94

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Solution

The fourth proportional to 128,672.82, 177,575.56 and 71,310.94 is: 98,413.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,672.82 : 177,575.56 = 71,310.94 : x
  2. Step 2: Convert to fraction form
    128,672.82/177,575.56 = 71,310.94/x
  3. Step 3: Cross multiply
    128,672.82x = 177,575.56 × 71,310.94
  4. Step 4: Simplify right side
    128,672.82x = 12,663,079,482.41
  5. Step 5: Solve for x
    x = 12,663,079,482.41/128,672.82
  6. Step 6: Final answer
    x = 98,413.01

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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.