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Finding the Fourth Proportional to 850.55, 1,276.23 and 485.47

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Solution

The fourth proportional to 850.55, 1,276.23 and 485.47 is: 728.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.55 : 1,276.23 = 485.47 : x
  2. Step 2: Convert to fraction form
    850.55/1,276.23 = 485.47/x
  3. Step 3: Cross multiply
    850.55x = 1,276.23 × 485.47
  4. Step 4: Simplify right side
    850.55x = 619,565.00
  5. Step 5: Solve for x
    x = 619,565.00/850.55
  6. Step 6: Final answer
    x = 728.43

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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.