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Finding the Fourth Proportional to 882.90, 1,321.20 and 768.60

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Solution

The fourth proportional to 882.90, 1,321.20 and 768.60 is: 1,150.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.90 : 1,321.20 = 768.60 : x
  2. Step 2: Convert to fraction form
    882.90/1,321.20 = 768.60/x
  3. Step 3: Cross multiply
    882.90x = 1,321.20 × 768.60
  4. Step 4: Simplify right side
    882.90x = 1,015,474.32
  5. Step 5: Solve for x
    x = 1,015,474.32/882.90
  6. Step 6: Final answer
    x = 1,150.16

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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.