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Finding the Fourth Proportional to 869.08, 1,192.94 and 768.64

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Solution

The fourth proportional to 869.08, 1,192.94 and 768.64 is: 1,055.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.08 : 1,192.94 = 768.64 : x
  2. Step 2: Convert to fraction form
    869.08/1,192.94 = 768.64/x
  3. Step 3: Cross multiply
    869.08x = 1,192.94 × 768.64
  4. Step 4: Simplify right side
    869.08x = 916,941.40
  5. Step 5: Solve for x
    x = 916,941.40/869.08
  6. Step 6: Final answer
    x = 1,055.07

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.