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Finding the Fourth Proportional to 850.73, 1,275.06 and 387.87

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Solution

The fourth proportional to 850.73, 1,275.06 and 387.87 is: 581.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.73 : 1,275.06 = 387.87 : x
  2. Step 2: Convert to fraction form
    850.73/1,275.06 = 387.87/x
  3. Step 3: Cross multiply
    850.73x = 1,275.06 × 387.87
  4. Step 4: Simplify right side
    850.73x = 494,557.52
  5. Step 5: Solve for x
    x = 494,557.52/850.73
  6. Step 6: Final answer
    x = 581.34

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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.