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Finding the Fourth Proportional to 328,878.92, 493,118.60 and 128,959.80

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Solution

The fourth proportional to 328,878.92, 493,118.60 and 128,959.80 is: 193,361.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,878.92 : 493,118.60 = 128,959.80 : x
  2. Step 2: Convert to fraction form
    328,878.92/493,118.60 = 128,959.80/x
  3. Step 3: Cross multiply
    328,878.92x = 493,118.60 × 128,959.80
  4. Step 4: Simplify right side
    328,878.92x = 63,592,476,032.28
  5. Step 5: Solve for x
    x = 63,592,476,032.28/328,878.92
  6. Step 6: Final answer
    x = 193,361.36

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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.