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Finding the Fourth Proportional to 417.70, 627.90 and 385.30

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Solution

The fourth proportional to 417.70, 627.90 and 385.30 is: 579.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.70 : 627.90 = 385.30 : x
  2. Step 2: Convert to fraction form
    417.70/627.90 = 385.30/x
  3. Step 3: Cross multiply
    417.70x = 627.90 × 385.30
  4. Step 4: Simplify right side
    417.70x = 241,929.87
  5. Step 5: Solve for x
    x = 241,929.87/417.70
  6. Step 6: Final answer
    x = 579.20

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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.