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Finding the Fourth Proportional to 342.10, 513.15 and 321.60

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Solution

The fourth proportional to 342.10, 513.15 and 321.60 is: 482.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.10 : 513.15 = 321.60 : x
  2. Step 2: Convert to fraction form
    342.10/513.15 = 321.60/x
  3. Step 3: Cross multiply
    342.10x = 513.15 × 321.60
  4. Step 4: Simplify right side
    342.10x = 165,029.04
  5. Step 5: Solve for x
    x = 165,029.04/342.10
  6. Step 6: Final answer
    x = 482.40

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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.