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Finding the Fourth Proportional to 258.40, 387.98 and 156.14

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Solution

The fourth proportional to 258.40, 387.98 and 156.14 is: 234.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.40 : 387.98 = 156.14 : x
  2. Step 2: Convert to fraction form
    258.40/387.98 = 156.14/x
  3. Step 3: Cross multiply
    258.40x = 387.98 × 156.14
  4. Step 4: Simplify right side
    258.40x = 60,579.20
  5. Step 5: Solve for x
    x = 60,579.20/258.40
  6. Step 6: Final answer
    x = 234.44

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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.