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Finding the Fourth Proportional to 520.50, 718.40 and 324.20

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Solution

The fourth proportional to 520.50, 718.40 and 324.20 is: 447.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.50 : 718.40 = 324.20 : x
  2. Step 2: Convert to fraction form
    520.50/718.40 = 324.20/x
  3. Step 3: Cross multiply
    520.50x = 718.40 × 324.20
  4. Step 4: Simplify right side
    520.50x = 232,905.28
  5. Step 5: Solve for x
    x = 232,905.28/520.50
  6. Step 6: Final answer
    x = 447.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.