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Finding the Fourth Proportional to 1,257.86, 1,735.64 and 698.31

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Solution

The fourth proportional to 1,257.86, 1,735.64 and 698.31 is: 963.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.86 : 1,735.64 = 698.31 : x
  2. Step 2: Convert to fraction form
    1,257.86/1,735.64 = 698.31/x
  3. Step 3: Cross multiply
    1,257.86x = 1,735.64 × 698.31
  4. Step 4: Simplify right side
    1,257.86x = 1,212,014.77
  5. Step 5: Solve for x
    x = 1,212,014.77/1,257.86
  6. Step 6: Final answer
    x = 963.56

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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.