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Finding the Fourth Proportional to 128,570.62, 177,262.56 and 99,841.54

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Solution

The fourth proportional to 128,570.62, 177,262.56 and 99,841.54 is: 137,653.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,570.62 : 177,262.56 = 99,841.54 : x
  2. Step 2: Convert to fraction form
    128,570.62/177,262.56 = 99,841.54/x
  3. Step 3: Cross multiply
    128,570.62x = 177,262.56 × 99,841.54
  4. Step 4: Simplify right side
    128,570.62x = 17,698,166,974.74
  5. Step 5: Solve for x
    x = 17,698,166,974.74/128,570.62
  6. Step 6: Final answer
    x = 137,653.28

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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.