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Finding the Fourth Proportional to 257, 386.40 and 135.50

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Solution

The fourth proportional to 257, 386.40 and 135.50 is: 203.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    257 : 386.40 = 135.50 : x
  2. Step 2: Convert to fraction form
    257/386.40 = 135.50/x
  3. Step 3: Cross multiply
    257x = 386.40 × 135.50
  4. Step 4: Simplify right side
    257x = 52,357.20
  5. Step 5: Solve for x
    x = 52,357.20/257
  6. Step 6: Final answer
    x = 203.72

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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.