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Finding the Fourth Proportional to 111,689.66, 154,132.23 and 61,391.90

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Solution

The fourth proportional to 111,689.66, 154,132.23 and 61,391.90 is: 84,721.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,689.66 : 154,132.23 = 61,391.90 : x
  2. Step 2: Convert to fraction form
    111,689.66/154,132.23 = 61,391.90/x
  3. Step 3: Cross multiply
    111,689.66x = 154,132.23 × 61,391.90
  4. Step 4: Simplify right side
    111,689.66x = 9,462,470,450.94
  5. Step 5: Solve for x
    x = 9,462,470,450.94/111,689.66
  6. Step 6: Final answer
    x = 84,721.10

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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.