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Finding the Fourth Proportional to 318.66, 478.26 and 164.76

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Solution

The fourth proportional to 318.66, 478.26 and 164.76 is: 247.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.66 : 478.26 = 164.76 : x
  2. Step 2: Convert to fraction form
    318.66/478.26 = 164.76/x
  3. Step 3: Cross multiply
    318.66x = 478.26 × 164.76
  4. Step 4: Simplify right side
    318.66x = 78,798.12
  5. Step 5: Solve for x
    x = 78,798.12/318.66
  6. Step 6: Final answer
    x = 247.28

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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.