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Finding the Fourth Proportional to 850.21, 1,275.35 and 388.01

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Solution

The fourth proportional to 850.21, 1,275.35 and 388.01 is: 582.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.21 : 1,275.35 = 388.01 : x
  2. Step 2: Convert to fraction form
    850.21/1,275.35 = 388.01/x
  3. Step 3: Cross multiply
    850.21x = 1,275.35 × 388.01
  4. Step 4: Simplify right side
    850.21x = 494,849.80
  5. Step 5: Solve for x
    x = 494,849.80/850.21
  6. Step 6: Final answer
    x = 582.03

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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.