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Finding the Fourth Proportional to 318.48, 476.78 and 257.10

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Solution

The fourth proportional to 318.48, 476.78 and 257.10 is: 384.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.48 : 476.78 = 257.10 : x
  2. Step 2: Convert to fraction form
    318.48/476.78 = 257.10/x
  3. Step 3: Cross multiply
    318.48x = 476.78 × 257.10
  4. Step 4: Simplify right side
    318.48x = 122,578.85
  5. Step 5: Solve for x
    x = 122,578.85/318.48
  6. Step 6: Final answer
    x = 384.89

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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.