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Finding the Fourth Proportional to 1,281.54, 1,921.17 and 512.58

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Solution

The fourth proportional to 1,281.54, 1,921.17 and 512.58 is: 768.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.54 : 1,921.17 = 512.58 : x
  2. Step 2: Convert to fraction form
    1,281.54/1,921.17 = 512.58/x
  3. Step 3: Cross multiply
    1,281.54x = 1,921.17 × 512.58
  4. Step 4: Simplify right side
    1,281.54x = 984,753.32
  5. Step 5: Solve for x
    x = 984,753.32/1,281.54
  6. Step 6: Final answer
    x = 768.41

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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.