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Finding the Fourth Proportional to 111,680, 154,118.40 and 61,379

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Solution

The fourth proportional to 111,680, 154,118.40 and 61,379 is: 84,703.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,680 : 154,118.40 = 61,379 : x
  2. Step 2: Convert to fraction form
    111,680/154,118.40 = 61,379/x
  3. Step 3: Cross multiply
    111,680x = 154,118.40 × 61,379
  4. Step 4: Simplify right side
    111,680x = 9,459,633,273.60
  5. Step 5: Solve for x
    x = 9,459,633,273.60/111,680
  6. Step 6: Final answer
    x = 84,703.02

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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.