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Finding the Fourth Proportional to 118,912.31, 178,386.90 and 40,020.38

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Solution

The fourth proportional to 118,912.31, 178,386.90 and 40,020.38 is: 60,036.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,912.31 : 178,386.90 = 40,020.38 : x
  2. Step 2: Convert to fraction form
    118,912.31/178,386.90 = 40,020.38/x
  3. Step 3: Cross multiply
    118,912.31x = 178,386.90 × 40,020.38
  4. Step 4: Simplify right side
    118,912.31x = 7,139,111,324.92
  5. Step 5: Solve for x
    x = 7,139,111,324.92/118,912.31
  6. Step 6: Final answer
    x = 60,036.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.