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Finding the Fourth Proportional to 111,979.79, 154,532.08 and 61,678.79

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Solution

The fourth proportional to 111,979.79, 154,532.08 and 61,678.79 is: 85,116.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,979.79 : 154,532.08 = 61,678.79 : x
  2. Step 2: Convert to fraction form
    111,979.79/154,532.08 = 61,678.79/x
  3. Step 3: Cross multiply
    111,979.79x = 154,532.08 × 61,678.79
  4. Step 4: Simplify right side
    111,979.79x = 9,531,351,710.58
  5. Step 5: Solve for x
    x = 9,531,351,710.58/111,979.79
  6. Step 6: Final answer
    x = 85,116.71

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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.