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Finding the Fourth Proportional to 1,287.54, 1,930.23 and 518.58

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Solution

The fourth proportional to 1,287.54, 1,930.23 and 518.58 is: 777.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.54 : 1,930.23 = 518.58 : x
  2. Step 2: Convert to fraction form
    1,287.54/1,930.23 = 518.58/x
  3. Step 3: Cross multiply
    1,287.54x = 1,930.23 × 518.58
  4. Step 4: Simplify right side
    1,287.54x = 1,000,978.67
  5. Step 5: Solve for x
    x = 1,000,978.67/1,287.54
  6. Step 6: Final answer
    x = 777.44

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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.