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Finding the Fourth Proportional to 151,355.78, 208,870.97 and 87,730.49

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Solution

The fourth proportional to 151,355.78, 208,870.97 and 87,730.49 is: 121,068.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    151,355.78 : 208,870.97 = 87,730.49 : x
  2. Step 2: Convert to fraction form
    151,355.78/208,870.97 = 87,730.49/x
  3. Step 3: Cross multiply
    151,355.78x = 208,870.97 × 87,730.49
  4. Step 4: Simplify right side
    151,355.78x = 18,324,351,061.87
  5. Step 5: Solve for x
    x = 18,324,351,061.87/151,355.78
  6. Step 6: Final answer
    x = 121,068.06

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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.