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Finding the Fourth Proportional to 111,691.16, 154,134.30 and 61,393.40

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Solution

The fourth proportional to 111,691.16, 154,134.30 and 61,393.40 is: 84,723.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,691.16 : 154,134.30 = 61,393.40 : x
  2. Step 2: Convert to fraction form
    111,691.16/154,134.30 = 61,393.40/x
  3. Step 3: Cross multiply
    111,691.16x = 154,134.30 × 61,393.40
  4. Step 4: Simplify right side
    111,691.16x = 9,462,828,733.62
  5. Step 5: Solve for x
    x = 9,462,828,733.62/111,691.16
  6. Step 6: Final answer
    x = 84,723.17

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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.