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Finding the Fourth Proportional to 385.47, 577.31 and 339.33

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Solution

The fourth proportional to 385.47, 577.31 and 339.33 is: 508.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.47 : 577.31 = 339.33 : x
  2. Step 2: Convert to fraction form
    385.47/577.31 = 339.33/x
  3. Step 3: Cross multiply
    385.47x = 577.31 × 339.33
  4. Step 4: Simplify right side
    385.47x = 195,896.91
  5. Step 5: Solve for x
    x = 195,896.91/385.47
  6. Step 6: Final answer
    x = 508.20

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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.