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Finding the Fourth Proportional to 328.76, 493.14 and 215.48

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Solution

The fourth proportional to 328.76, 493.14 and 215.48 is: 323.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.76 : 493.14 = 215.48 : x
  2. Step 2: Convert to fraction form
    328.76/493.14 = 215.48/x
  3. Step 3: Cross multiply
    328.76x = 493.14 × 215.48
  4. Step 4: Simplify right side
    328.76x = 106,261.81
  5. Step 5: Solve for x
    x = 106,261.81/328.76
  6. Step 6: Final answer
    x = 323.22

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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.