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Finding the Fourth Proportional to 1,270.72, 1,907 and 654.92

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Solution

The fourth proportional to 1,270.72, 1,907 and 654.92 is: 982.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.72 : 1,907 = 654.92 : x
  2. Step 2: Convert to fraction form
    1,270.72/1,907 = 654.92/x
  3. Step 3: Cross multiply
    1,270.72x = 1,907 × 654.92
  4. Step 4: Simplify right side
    1,270.72x = 1,248,932.44
  5. Step 5: Solve for x
    x = 1,248,932.44/1,270.72
  6. Step 6: Final answer
    x = 982.85

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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.