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Finding the Fourth Proportional to 517.95, 715.23 and 321.80

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Solution

The fourth proportional to 517.95, 715.23 and 321.80 is: 444.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.95 : 715.23 = 321.80 : x
  2. Step 2: Convert to fraction form
    517.95/715.23 = 321.80/x
  3. Step 3: Cross multiply
    517.95x = 715.23 × 321.80
  4. Step 4: Simplify right side
    517.95x = 230,157.44
  5. Step 5: Solve for x
    x = 230,157.44/517.95
  6. Step 6: Final answer
    x = 444.36

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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.