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Finding the Fourth Proportional to 420.10, 628.50 and 276.10

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Solution

The fourth proportional to 420.10, 628.50 and 276.10 is: 413.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.10 : 628.50 = 276.10 : x
  2. Step 2: Convert to fraction form
    420.10/628.50 = 276.10/x
  3. Step 3: Cross multiply
    420.10x = 628.50 × 276.10
  4. Step 4: Simplify right side
    420.10x = 173,528.85
  5. Step 5: Solve for x
    x = 173,528.85/420.10
  6. Step 6: Final answer
    x = 413.07

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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.