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Finding the Fourth Proportional to 386,329.20, 579,493.80 and 328,009.20

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Solution

The fourth proportional to 386,329.20, 579,493.80 and 328,009.20 is: 492,013.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,329.20 : 579,493.80 = 328,009.20 : x
  2. Step 2: Convert to fraction form
    386,329.20/579,493.80 = 328,009.20/x
  3. Step 3: Cross multiply
    386,329.20x = 579,493.80 × 328,009.20
  4. Step 4: Simplify right side
    386,329.20x = 190,079,297,742.96
  5. Step 5: Solve for x
    x = 190,079,297,742.96/386,329.20
  6. Step 6: Final answer
    x = 492,013.80

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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.