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Finding the Fourth Proportional to 258.60, 385.72 and 250.91

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Solution

The fourth proportional to 258.60, 385.72 and 250.91 is: 374.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.60 : 385.72 = 250.91 : x
  2. Step 2: Convert to fraction form
    258.60/385.72 = 250.91/x
  3. Step 3: Cross multiply
    258.60x = 385.72 × 250.91
  4. Step 4: Simplify right side
    258.60x = 96,781.01
  5. Step 5: Solve for x
    x = 96,781.01/258.60
  6. Step 6: Final answer
    x = 374.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.