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Finding the Fourth Proportional to 388,930.80, 583,396.20 and 326,722.80

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Solution

The fourth proportional to 388,930.80, 583,396.20 and 326,722.80 is: 490,084.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,930.80 : 583,396.20 = 326,722.80 : x
  2. Step 2: Convert to fraction form
    388,930.80/583,396.20 = 326,722.80/x
  3. Step 3: Cross multiply
    388,930.80x = 583,396.20 × 326,722.80
  4. Step 4: Simplify right side
    388,930.80x = 190,608,839,973.36
  5. Step 5: Solve for x
    x = 190,608,839,973.36/388,930.80
  6. Step 6: Final answer
    x = 490,084.20

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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.