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Finding the Fourth Proportional to 385.80, 579.15 and 383.10

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Solution

The fourth proportional to 385.80, 579.15 and 383.10 is: 575.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.80 : 579.15 = 383.10 : x
  2. Step 2: Convert to fraction form
    385.80/579.15 = 383.10/x
  3. Step 3: Cross multiply
    385.80x = 579.15 × 383.10
  4. Step 4: Simplify right side
    385.80x = 221,872.37
  5. Step 5: Solve for x
    x = 221,872.37/385.80
  6. Step 6: Final answer
    x = 575.10

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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.