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Finding the Fourth Proportional to 452.57, 678.86 and 257.47

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Solution

The fourth proportional to 452.57, 678.86 and 257.47 is: 386.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.57 : 678.86 = 257.47 : x
  2. Step 2: Convert to fraction form
    452.57/678.86 = 257.47/x
  3. Step 3: Cross multiply
    452.57x = 678.86 × 257.47
  4. Step 4: Simplify right side
    452.57x = 174,781.40
  5. Step 5: Solve for x
    x = 174,781.40/452.57
  6. Step 6: Final answer
    x = 386.20

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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.