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Finding the Fourth Proportional to 1,285.22, 1,927.87 and 407.73

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Solution

The fourth proportional to 1,285.22, 1,927.87 and 407.73 is: 611.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.22 : 1,927.87 = 407.73 : x
  2. Step 2: Convert to fraction form
    1,285.22/1,927.87 = 407.73/x
  3. Step 3: Cross multiply
    1,285.22x = 1,927.87 × 407.73
  4. Step 4: Simplify right side
    1,285.22x = 786,042.19
  5. Step 5: Solve for x
    x = 786,042.19/1,285.22
  6. Step 6: Final answer
    x = 611.60

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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.