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Finding the Fourth Proportional to 258.79, 387.71 and 148.99

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Solution

The fourth proportional to 258.79, 387.71 and 148.99 is: 223.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.79 : 387.71 = 148.99 : x
  2. Step 2: Convert to fraction form
    258.79/387.71 = 148.99/x
  3. Step 3: Cross multiply
    258.79x = 387.71 × 148.99
  4. Step 4: Simplify right side
    258.79x = 57,763.20
  5. Step 5: Solve for x
    x = 57,763.20/258.79
  6. Step 6: Final answer
    x = 223.21

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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.