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Finding the Fourth Proportional to 850.87, 1,275.76 and 485.15

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Solution

The fourth proportional to 850.87, 1,275.76 and 485.15 is: 727.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.87 : 1,275.76 = 485.15 : x
  2. Step 2: Convert to fraction form
    850.87/1,275.76 = 485.15/x
  3. Step 3: Cross multiply
    850.87x = 1,275.76 × 485.15
  4. Step 4: Simplify right side
    850.87x = 618,934.96
  5. Step 5: Solve for x
    x = 618,934.96/850.87
  6. Step 6: Final answer
    x = 727.41

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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.