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Finding the Fourth Proportional to 357.76, 534.08 and 321.28

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Solution

The fourth proportional to 357.76, 534.08 and 321.28 is: 479.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.76 : 534.08 = 321.28 : x
  2. Step 2: Convert to fraction form
    357.76/534.08 = 321.28/x
  3. Step 3: Cross multiply
    357.76x = 534.08 × 321.28
  4. Step 4: Simplify right side
    357.76x = 171,589.22
  5. Step 5: Solve for x
    x = 171,589.22/357.76
  6. Step 6: Final answer
    x = 479.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.