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Finding the Fourth Proportional to 74,243.40, 111,315.90 and 40,979.40

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Solution

The fourth proportional to 74,243.40, 111,315.90 and 40,979.40 is: 61,441.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,243.40 : 111,315.90 = 40,979.40 : x
  2. Step 2: Convert to fraction form
    74,243.40/111,315.90 = 40,979.40/x
  3. Step 3: Cross multiply
    74,243.40x = 111,315.90 × 40,979.40
  4. Step 4: Simplify right side
    74,243.40x = 4,561,658,792.46
  5. Step 5: Solve for x
    x = 4,561,658,792.46/74,243.40
  6. Step 6: Final answer
    x = 61,441.94

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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.