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Finding the Fourth Proportional to 452.50, 678.79 and 257.43

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Solution

The fourth proportional to 452.50, 678.79 and 257.43 is: 386.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.50 : 678.79 = 257.43 : x
  2. Step 2: Convert to fraction form
    452.50/678.79 = 257.43/x
  3. Step 3: Cross multiply
    452.50x = 678.79 × 257.43
  4. Step 4: Simplify right side
    452.50x = 174,740.91
  5. Step 5: Solve for x
    x = 174,740.91/452.50
  6. Step 6: Final answer
    x = 386.17

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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.