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Finding the Fourth Proportional to 74,719.88, 103,112.76 and 40,728.36

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Solution

The fourth proportional to 74,719.88, 103,112.76 and 40,728.36 is: 56,204.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,719.88 : 103,112.76 = 40,728.36 : x
  2. Step 2: Convert to fraction form
    74,719.88/103,112.76 = 40,728.36/x
  3. Step 3: Cross multiply
    74,719.88x = 103,112.76 × 40,728.36
  4. Step 4: Simplify right side
    74,719.88x = 4,199,613,843.82
  5. Step 5: Solve for x
    x = 4,199,613,843.82/74,719.88
  6. Step 6: Final answer
    x = 56,204.77

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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.