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Finding the Fourth Proportional to 257.50, 386.05 and 149.10

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Solution

The fourth proportional to 257.50, 386.05 and 149.10 is: 223.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.50 : 386.05 = 149.10 : x
  2. Step 2: Convert to fraction form
    257.50/386.05 = 149.10/x
  3. Step 3: Cross multiply
    257.50x = 386.05 × 149.10
  4. Step 4: Simplify right side
    257.50x = 57,560.06
  5. Step 5: Solve for x
    x = 57,560.06/257.50
  6. Step 6: Final answer
    x = 223.53

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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.