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Finding the Fourth Proportional to 925.12, 1,276 and 629.92

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Solution

The fourth proportional to 925.12, 1,276 and 629.92 is: 868.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.12 : 1,276 = 629.92 : x
  2. Step 2: Convert to fraction form
    925.12/1,276 = 629.92/x
  3. Step 3: Cross multiply
    925.12x = 1,276 × 629.92
  4. Step 4: Simplify right side
    925.12x = 803,777.92
  5. Step 5: Solve for x
    x = 803,777.92/925.12
  6. Step 6: Final answer
    x = 868.84

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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.