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Finding the Fourth Proportional to 478.85, 658.61 and 385.38

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Solution

The fourth proportional to 478.85, 658.61 and 385.38 is: 530.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.85 : 658.61 = 385.38 : x
  2. Step 2: Convert to fraction form
    478.85/658.61 = 385.38/x
  3. Step 3: Cross multiply
    478.85x = 658.61 × 385.38
  4. Step 4: Simplify right side
    478.85x = 253,813.19
  5. Step 5: Solve for x
    x = 253,813.19/478.85
  6. Step 6: Final answer
    x = 530.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.