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Finding the Fourth Proportional to 111,940.64, 154,477.68 and 61,639.52

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Solution

The fourth proportional to 111,940.64, 154,477.68 and 61,639.52 is: 85,062.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,940.64 : 154,477.68 = 61,639.52 : x
  2. Step 2: Convert to fraction form
    111,940.64/154,477.68 = 61,639.52/x
  3. Step 3: Cross multiply
    111,940.64x = 154,477.68 × 61,639.52
  4. Step 4: Simplify right side
    111,940.64x = 9,521,930,045.91
  5. Step 5: Solve for x
    x = 9,521,930,045.91/111,940.64
  6. Step 6: Final answer
    x = 85,062.32

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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.