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Finding the Fourth Proportional to 880.35, 1,319.91 and 418.05

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Solution

The fourth proportional to 880.35, 1,319.91 and 418.05 is: 626.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.35 : 1,319.91 = 418.05 : x
  2. Step 2: Convert to fraction form
    880.35/1,319.91 = 418.05/x
  3. Step 3: Cross multiply
    880.35x = 1,319.91 × 418.05
  4. Step 4: Simplify right side
    880.35x = 551,788.38
  5. Step 5: Solve for x
    x = 551,788.38/880.35
  6. Step 6: Final answer
    x = 626.78

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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.