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Finding the Fourth Proportional to 257.80, 386.79 and 101.63

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Solution

The fourth proportional to 257.80, 386.79 and 101.63 is: 152.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.80 : 386.79 = 101.63 : x
  2. Step 2: Convert to fraction form
    257.80/386.79 = 101.63/x
  3. Step 3: Cross multiply
    257.80x = 386.79 × 101.63
  4. Step 4: Simplify right side
    257.80x = 39,309.47
  5. Step 5: Solve for x
    x = 39,309.47/257.80
  6. Step 6: Final answer
    x = 152.48

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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.