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Finding the Fourth Proportional to 258.43, 387.80 and 148.88

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Solution

The fourth proportional to 258.43, 387.80 and 148.88 is: 223.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.43 : 387.80 = 148.88 : x
  2. Step 2: Convert to fraction form
    258.43/387.80 = 148.88/x
  3. Step 3: Cross multiply
    258.43x = 387.80 × 148.88
  4. Step 4: Simplify right side
    258.43x = 57,733.71
  5. Step 5: Solve for x
    x = 57,733.71/258.43
  6. Step 6: Final answer
    x = 223.41

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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.