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Finding the Fourth Proportional to 111,186.47, 153,431.26 and 65,868.64

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Solution

The fourth proportional to 111,186.47, 153,431.26 and 65,868.64 is: 90,895.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,186.47 : 153,431.26 = 65,868.64 : x
  2. Step 2: Convert to fraction form
    111,186.47/153,431.26 = 65,868.64/x
  3. Step 3: Cross multiply
    111,186.47x = 153,431.26 × 65,868.64
  4. Step 4: Simplify right side
    111,186.47x = 10,106,309,115.00
  5. Step 5: Solve for x
    x = 10,106,309,115.00/111,186.47
  6. Step 6: Final answer
    x = 90,895.13

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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.