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Finding the Fourth Proportional to 925.20, 1,276.75 and 511.20

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Solution

The fourth proportional to 925.20, 1,276.75 and 511.20 is: 705.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    925.20 : 1,276.75 = 511.20 : x
  2. Step 2: Convert to fraction form
    925.20/1,276.75 = 511.20/x
  3. Step 3: Cross multiply
    925.20x = 1,276.75 × 511.20
  4. Step 4: Simplify right side
    925.20x = 652,674.60
  5. Step 5: Solve for x
    x = 652,674.60/925.20
  6. Step 6: Final answer
    x = 705.44

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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.