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Finding the Fourth Proportional to 213,079.09, 319,583.75 and 86,714.23

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Solution

The fourth proportional to 213,079.09, 319,583.75 and 86,714.23 is: 130,057.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,079.09 : 319,583.75 = 86,714.23 : x
  2. Step 2: Convert to fraction form
    213,079.09/319,583.75 = 86,714.23/x
  3. Step 3: Cross multiply
    213,079.09x = 319,583.75 × 86,714.23
  4. Step 4: Simplify right side
    213,079.09x = 27,712,458,801.76
  5. Step 5: Solve for x
    x = 27,712,458,801.76/213,079.09
  6. Step 6: Final answer
    x = 130,057.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.