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Finding the Fourth Proportional to 151,356.78, 208,872.34 and 87,731.49

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Solution

The fourth proportional to 151,356.78, 208,872.34 and 87,731.49 is: 121,069.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    151,356.78 : 208,872.34 = 87,731.49 : x
  2. Step 2: Convert to fraction form
    151,356.78/208,872.34 = 87,731.49/x
  3. Step 3: Cross multiply
    151,356.78x = 208,872.34 × 87,731.49
  4. Step 4: Simplify right side
    151,356.78x = 18,324,681,607.99
  5. Step 5: Solve for x
    x = 18,324,681,607.99/151,356.78
  6. Step 6: Final answer
    x = 121,069.45

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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.