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Finding the Fourth Proportional to 385.69, 577.86 and 321.10

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Solution

The fourth proportional to 385.69, 577.86 and 321.10 is: 481.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.69 : 577.86 = 321.10 : x
  2. Step 2: Convert to fraction form
    385.69/577.86 = 321.10/x
  3. Step 3: Cross multiply
    385.69x = 577.86 × 321.10
  4. Step 4: Simplify right side
    385.69x = 185,552.76
  5. Step 5: Solve for x
    x = 185,552.76/385.69
  6. Step 6: Final answer
    x = 481.09

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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.