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Finding the Fourth Proportional to 154,940.50, 213,817.89 and 87,872.50

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Solution

The fourth proportional to 154,940.50, 213,817.89 and 87,872.50 is: 121,264.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,940.50 : 213,817.89 = 87,872.50 : x
  2. Step 2: Convert to fraction form
    154,940.50/213,817.89 = 87,872.50/x
  3. Step 3: Cross multiply
    154,940.50x = 213,817.89 × 87,872.50
  4. Step 4: Simplify right side
    154,940.50x = 18,788,712,539.03
  5. Step 5: Solve for x
    x = 18,788,712,539.03/154,940.50
  6. Step 6: Final answer
    x = 121,264.05

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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.