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Finding the Fourth Proportional to 318.86, 478.28 and 181.48

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Solution

The fourth proportional to 318.86, 478.28 and 181.48 is: 272.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.86 : 478.28 = 181.48 : x
  2. Step 2: Convert to fraction form
    318.86/478.28 = 181.48/x
  3. Step 3: Cross multiply
    318.86x = 478.28 × 181.48
  4. Step 4: Simplify right side
    318.86x = 86,798.25
  5. Step 5: Solve for x
    x = 86,798.25/318.86
  6. Step 6: Final answer
    x = 272.21

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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.