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Finding the Fourth Proportional to 74,679.40, 103,057.00 and 40,687.79

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Solution

The fourth proportional to 74,679.40, 103,057.00 and 40,687.79 is: 56,148.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,679.40 : 103,057.00 = 40,687.79 : x
  2. Step 2: Convert to fraction form
    74,679.40/103,057.00 = 40,687.79/x
  3. Step 3: Cross multiply
    74,679.40x = 103,057.00 × 40,687.79
  4. Step 4: Simplify right side
    74,679.40x = 4,193,161,160.46
  5. Step 5: Solve for x
    x = 4,193,161,160.46/74,679.40
  6. Step 6: Final answer
    x = 56,148.83

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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.