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Finding the Fourth Proportional to 111,392.97, 153,792.18 and 77,390.52

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Solution

The fourth proportional to 111,392.97, 153,792.18 and 77,390.52 is: 106,847.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,392.97 : 153,792.18 = 77,390.52 : x
  2. Step 2: Convert to fraction form
    111,392.97/153,792.18 = 77,390.52/x
  3. Step 3: Cross multiply
    111,392.97x = 153,792.18 × 77,390.52
  4. Step 4: Simplify right side
    111,392.97x = 11,902,056,782.13
  5. Step 5: Solve for x
    x = 11,902,056,782.13/111,392.97
  6. Step 6: Final answer
    x = 106,847.47

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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.