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Finding the Fourth Proportional to 328,517.68, 493,053.48 and 128,978.20

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Solution

The fourth proportional to 328,517.68, 493,053.48 and 128,978.20 is: 193,576.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,517.68 : 493,053.48 = 128,978.20 : x
  2. Step 2: Convert to fraction form
    328,517.68/493,053.48 = 128,978.20/x
  3. Step 3: Cross multiply
    328,517.68x = 493,053.48 × 128,978.20
  4. Step 4: Simplify right side
    328,517.68x = 63,593,150,354.14
  5. Step 5: Solve for x
    x = 63,593,150,354.14/328,517.68
  6. Step 6: Final answer
    x = 193,576.04

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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.