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Finding the Fourth Proportional to 128,990.66, 178,001.11 and 71,633.62

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Solution

The fourth proportional to 128,990.66, 178,001.11 and 71,633.62 is: 98,851.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,990.66 : 178,001.11 = 71,633.62 : x
  2. Step 2: Convert to fraction form
    128,990.66/178,001.11 = 71,633.62/x
  3. Step 3: Cross multiply
    128,990.66x = 178,001.11 × 71,633.62
  4. Step 4: Simplify right side
    128,990.66x = 12,750,863,873.32
  5. Step 5: Solve for x
    x = 12,750,863,873.32/128,990.66
  6. Step 6: Final answer
    x = 98,851.06

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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.