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Finding the Fourth Proportional to 850.75, 1,276.16 and 439.63

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Solution

The fourth proportional to 850.75, 1,276.16 and 439.63 is: 659.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.75 : 1,276.16 = 439.63 : x
  2. Step 2: Convert to fraction form
    850.75/1,276.16 = 439.63/x
  3. Step 3: Cross multiply
    850.75x = 1,276.16 × 439.63
  4. Step 4: Simplify right side
    850.75x = 561,032.83
  5. Step 5: Solve for x
    x = 561,032.83/850.75
  6. Step 6: Final answer
    x = 659.45

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1.5x scale

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.