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Finding the Fourth Proportional to 420.04, 628.86 and 276.04

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Solution

The fourth proportional to 420.04, 628.86 and 276.04 is: 413.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.04 : 628.86 = 276.04 : x
  2. Step 2: Convert to fraction form
    420.04/628.86 = 276.04/x
  3. Step 3: Cross multiply
    420.04x = 628.86 × 276.04
  4. Step 4: Simplify right side
    420.04x = 173,590.51
  5. Step 5: Solve for x
    x = 173,590.51/420.04
  6. Step 6: Final answer
    x = 413.27

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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.