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Finding the Fourth Proportional to 850.09, 1,275.57 and 387.81

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Solution

The fourth proportional to 850.09, 1,275.57 and 387.81 is: 581.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.09 : 1,275.57 = 387.81 : x
  2. Step 2: Convert to fraction form
    850.09/1,275.57 = 387.81/x
  3. Step 3: Cross multiply
    850.09x = 1,275.57 × 387.81
  4. Step 4: Simplify right side
    850.09x = 494,678.80
  5. Step 5: Solve for x
    x = 494,678.80/850.09
  6. Step 6: Final answer
    x = 581.91

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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.