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Finding the Fourth Proportional to 850.61, 1,276.60 and 439.87

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Solution

The fourth proportional to 850.61, 1,276.60 and 439.87 is: 660.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.61 : 1,276.60 = 439.87 : x
  2. Step 2: Convert to fraction form
    850.61/1,276.60 = 439.87/x
  3. Step 3: Cross multiply
    850.61x = 1,276.60 × 439.87
  4. Step 4: Simplify right side
    850.61x = 561,538.04
  5. Step 5: Solve for x
    x = 561,538.04/850.61
  6. Step 6: Final answer
    x = 660.16

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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.