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Finding the Fourth Proportional to 851.76, 1,172.61 and 764.28

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Solution

The fourth proportional to 851.76, 1,172.61 and 764.28 is: 1,052.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.76 : 1,172.61 = 764.28 : x
  2. Step 2: Convert to fraction form
    851.76/1,172.61 = 764.28/x
  3. Step 3: Cross multiply
    851.76x = 1,172.61 × 764.28
  4. Step 4: Simplify right side
    851.76x = 896,202.37
  5. Step 5: Solve for x
    x = 896,202.37/851.76
  6. Step 6: Final answer
    x = 1,052.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.