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Finding the Fourth Proportional to 138,167.50, 190,671.15 and 78,551.50

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Solution

The fourth proportional to 138,167.50, 190,671.15 and 78,551.50 is: 108,401.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,167.50 : 190,671.15 = 78,551.50 : x
  2. Step 2: Convert to fraction form
    138,167.50/190,671.15 = 78,551.50/x
  3. Step 3: Cross multiply
    138,167.50x = 190,671.15 × 78,551.50
  4. Step 4: Simplify right side
    138,167.50x = 14,977,504,839.23
  5. Step 5: Solve for x
    x = 14,977,504,839.23/138,167.50
  6. Step 6: Final answer
    x = 108,401.07

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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.