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Finding the Fourth Proportional to 319.49, 478.76 and 165.21

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Solution

The fourth proportional to 319.49, 478.76 and 165.21 is: 247.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.49 : 478.76 = 165.21 : x
  2. Step 2: Convert to fraction form
    319.49/478.76 = 165.21/x
  3. Step 3: Cross multiply
    319.49x = 478.76 × 165.21
  4. Step 4: Simplify right side
    319.49x = 79,098.46
  5. Step 5: Solve for x
    x = 79,098.46/319.49
  6. Step 6: Final answer
    x = 247.57

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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.