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Finding the Fourth Proportional to 385.91, 577.34 and 339.54

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Solution

The fourth proportional to 385.91, 577.34 and 339.54 is: 507.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.91 : 577.34 = 339.54 : x
  2. Step 2: Convert to fraction form
    385.91/577.34 = 339.54/x
  3. Step 3: Cross multiply
    385.91x = 577.34 × 339.54
  4. Step 4: Simplify right side
    385.91x = 196,030.02
  5. Step 5: Solve for x
    x = 196,030.02/385.91
  6. Step 6: Final answer
    x = 507.97

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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.