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Finding the Fourth Proportional to 111,891, 154,409.58 and 61,590

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Solution

The fourth proportional to 111,891, 154,409.58 and 61,590 is: 84,994.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,891 : 154,409.58 = 61,590 : x
  2. Step 2: Convert to fraction form
    111,891/154,409.58 = 61,590/x
  3. Step 3: Cross multiply
    111,891x = 154,409.58 × 61,590
  4. Step 4: Simplify right side
    111,891x = 9,510,086,032.20
  5. Step 5: Solve for x
    x = 9,510,086,032.20/111,891
  6. Step 6: Final answer
    x = 84,994.20

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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.