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Finding the Fourth Proportional to 862.94, 1,299.26 and 760.88

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Solution

The fourth proportional to 862.94, 1,299.26 and 760.88 is: 1,145.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.94 : 1,299.26 = 760.88 : x
  2. Step 2: Convert to fraction form
    862.94/1,299.26 = 760.88/x
  3. Step 3: Cross multiply
    862.94x = 1,299.26 × 760.88
  4. Step 4: Simplify right side
    862.94x = 988,580.95
  5. Step 5: Solve for x
    x = 988,580.95/862.94
  6. Step 6: Final answer
    x = 1,145.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.