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Finding the Fourth Proportional to 74,912.75, 103,379.95 and 40,921.71

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Solution

The fourth proportional to 74,912.75, 103,379.95 and 40,921.71 is: 56,472.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,912.75 : 103,379.95 = 40,921.71 : x
  2. Step 2: Convert to fraction form
    74,912.75/103,379.95 = 40,921.71/x
  3. Step 3: Cross multiply
    74,912.75x = 103,379.95 × 40,921.71
  4. Step 4: Simplify right side
    74,912.75x = 4,230,483,870.66
  5. Step 5: Solve for x
    x = 4,230,483,870.66/74,912.75
  6. Step 6: Final answer
    x = 56,472.15

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1.5x scale

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.