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Finding the Fourth Proportional to 388,645.20, 583,842.60 and 378,147.60

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Solution

The fourth proportional to 388,645.20, 583,842.60 and 378,147.60 is: 568,072.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,645.20 : 583,842.60 = 378,147.60 : x
  2. Step 2: Convert to fraction form
    388,645.20/583,842.60 = 378,147.60/x
  3. Step 3: Cross multiply
    388,645.20x = 583,842.60 × 378,147.60
  4. Step 4: Simplify right side
    388,645.20x = 220,778,677,967.76
  5. Step 5: Solve for x
    x = 220,778,677,967.76/388,645.20
  6. Step 6: Final answer
    x = 568,072.57

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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.