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Finding the Fourth Proportional to 257.81, 386.64 and 95.40

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Solution

The fourth proportional to 257.81, 386.64 and 95.40 is: 143.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.81 : 386.64 = 95.40 : x
  2. Step 2: Convert to fraction form
    257.81/386.64 = 95.40/x
  3. Step 3: Cross multiply
    257.81x = 386.64 × 95.40
  4. Step 4: Simplify right side
    257.81x = 36,885.46
  5. Step 5: Solve for x
    x = 36,885.46/257.81
  6. Step 6: Final answer
    x = 143.08

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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.