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Finding the Fourth Proportional to 668.51, 1,002.73 and 257.84

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Solution

The fourth proportional to 668.51, 1,002.73 and 257.84 is: 386.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.51 : 1,002.73 = 257.84 : x
  2. Step 2: Convert to fraction form
    668.51/1,002.73 = 257.84/x
  3. Step 3: Cross multiply
    668.51x = 1,002.73 × 257.84
  4. Step 4: Simplify right side
    668.51x = 258,543.90
  5. Step 5: Solve for x
    x = 258,543.90/668.51
  6. Step 6: Final answer
    x = 386.75

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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.