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Finding the Fourth Proportional to 668.74, 1,003.51 and 258.23

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Solution

The fourth proportional to 668.74, 1,003.51 and 258.23 is: 387.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.74 : 1,003.51 = 258.23 : x
  2. Step 2: Convert to fraction form
    668.74/1,003.51 = 258.23/x
  3. Step 3: Cross multiply
    668.74x = 1,003.51 × 258.23
  4. Step 4: Simplify right side
    668.74x = 259,132.89
  5. Step 5: Solve for x
    x = 259,132.89/668.74
  6. Step 6: Final answer
    x = 387.49

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Double scale
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1.5x scale

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.