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Finding the Fourth Proportional to 135,372, 186,787.44 and 87,618.72

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Solution

The fourth proportional to 135,372, 186,787.44 and 87,618.72 is: 120,897.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,372 : 186,787.44 = 87,618.72 : x
  2. Step 2: Convert to fraction form
    135,372/186,787.44 = 87,618.72/x
  3. Step 3: Cross multiply
    135,372x = 186,787.44 × 87,618.72
  4. Step 4: Simplify right side
    135,372x = 16,366,076,404.88
  5. Step 5: Solve for x
    x = 16,366,076,404.88/135,372
  6. Step 6: Final answer
    x = 120,897.06

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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.