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Finding the Fourth Proportional to 138,609.63, 191,281.43 and 74,947.41

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Solution

The fourth proportional to 138,609.63, 191,281.43 and 74,947.41 is: 103,427.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,609.63 : 191,281.43 = 74,947.41 : x
  2. Step 2: Convert to fraction form
    138,609.63/191,281.43 = 74,947.41/x
  3. Step 3: Cross multiply
    138,609.63x = 191,281.43 × 74,947.41
  4. Step 4: Simplify right side
    138,609.63x = 14,336,047,384.86
  5. Step 5: Solve for x
    x = 14,336,047,384.86/138,609.63
  6. Step 6: Final answer
    x = 103,427.50

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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.