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Finding the Fourth Proportional to 328,694.19, 492,818.80 and 128,889.87

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Solution

The fourth proportional to 328,694.19, 492,818.80 and 128,889.87 is: 193,247.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,694.19 : 492,818.80 = 128,889.87 : x
  2. Step 2: Convert to fraction form
    328,694.19/492,818.80 = 128,889.87/x
  3. Step 3: Cross multiply
    328,694.19x = 492,818.80 × 128,889.87
  4. Step 4: Simplify right side
    328,694.19x = 63,519,351,065.56
  5. Step 5: Solve for x
    x = 63,519,351,065.56/328,694.19
  6. Step 6: Final answer
    x = 193,247.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.