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Finding the Fourth Proportional to 328,628.80, 492,578.70 and 128,882.80

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Solution

The fourth proportional to 328,628.80, 492,578.70 and 128,882.80 is: 193,181.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,628.80 : 492,578.70 = 128,882.80 : x
  2. Step 2: Convert to fraction form
    328,628.80/492,578.70 = 128,882.80/x
  3. Step 3: Cross multiply
    328,628.80x = 492,578.70 × 128,882.80
  4. Step 4: Simplify right side
    328,628.80x = 63,484,922,076.36
  5. Step 5: Solve for x
    x = 63,484,922,076.36/328,628.80
  6. Step 6: Final answer
    x = 193,181.25

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1.5x scale

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.