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Finding the Fourth Proportional to 74,378.94, 102,641.20 and 40,387.51

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Solution

The fourth proportional to 74,378.94, 102,641.20 and 40,387.51 is: 55,733.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,378.94 : 102,641.20 = 40,387.51 : x
  2. Step 2: Convert to fraction form
    74,378.94/102,641.20 = 40,387.51/x
  3. Step 3: Cross multiply
    74,378.94x = 102,641.20 × 40,387.51
  4. Step 4: Simplify right side
    74,378.94x = 4,145,422,491.41
  5. Step 5: Solve for x
    x = 4,145,422,491.41/74,378.94
  6. Step 6: Final answer
    x = 55,733.82

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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.