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Finding the Fourth Proportional to 385.48, 580.82 and 318.50

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Solution

The fourth proportional to 385.48, 580.82 and 318.50 is: 479.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.48 : 580.82 = 318.50 : x
  2. Step 2: Convert to fraction form
    385.48/580.82 = 318.50/x
  3. Step 3: Cross multiply
    385.48x = 580.82 × 318.50
  4. Step 4: Simplify right side
    385.48x = 184,991.03
  5. Step 5: Solve for x
    x = 184,991.03/385.48
  6. Step 6: Final answer
    x = 479.90

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.