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Finding the Fourth Proportional to 851.11, 1,274 and 655.60

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Solution

The fourth proportional to 851.11, 1,274 and 655.60 is: 981.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.11 : 1,274 = 655.60 : x
  2. Step 2: Convert to fraction form
    851.11/1,274 = 655.60/x
  3. Step 3: Cross multiply
    851.11x = 1,274 × 655.60
  4. Step 4: Simplify right side
    851.11x = 835,234.40
  5. Step 5: Solve for x
    x = 835,234.40/851.11
  6. Step 6: Final answer
    x = 981.35

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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.