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Finding the Fourth Proportional to 258.50, 387.75 and 87.50

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Solution

The fourth proportional to 258.50, 387.75 and 87.50 is: 131.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.50 : 387.75 = 87.50 : x
  2. Step 2: Convert to fraction form
    258.50/387.75 = 87.50/x
  3. Step 3: Cross multiply
    258.50x = 387.75 × 87.50
  4. Step 4: Simplify right side
    258.50x = 33,928.13
  5. Step 5: Solve for x
    x = 33,928.13/258.50
  6. Step 6: Final answer
    x = 131.25

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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.