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Finding the Fourth Proportional to 111,979.67, 154,531.92 and 61,678.67

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Solution

The fourth proportional to 111,979.67, 154,531.92 and 61,678.67 is: 85,116.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,979.67 : 154,531.92 = 61,678.67 : x
  2. Step 2: Convert to fraction form
    111,979.67/154,531.92 = 61,678.67/x
  3. Step 3: Cross multiply
    111,979.67x = 154,531.92 × 61,678.67
  4. Step 4: Simplify right side
    111,979.67x = 9,531,323,298.15
  5. Step 5: Solve for x
    x = 9,531,323,298.15/111,979.67
  6. Step 6: Final answer
    x = 85,116.55

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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.