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Finding the Fourth Proportional to 257.13, 385.70 and 64.75

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Solution

The fourth proportional to 257.13, 385.70 and 64.75 is: 97.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.13 : 385.70 = 64.75 : x
  2. Step 2: Convert to fraction form
    257.13/385.70 = 64.75/x
  3. Step 3: Cross multiply
    257.13x = 385.70 × 64.75
  4. Step 4: Simplify right side
    257.13x = 24,974.08
  5. Step 5: Solve for x
    x = 24,974.08/257.13
  6. Step 6: Final answer
    x = 97.13

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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.