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Finding the Fourth Proportional to 880.20, 1,319.99 and 418.21

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Solution

The fourth proportional to 880.20, 1,319.99 and 418.21 is: 627.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.20 : 1,319.99 = 418.21 : x
  2. Step 2: Convert to fraction form
    880.20/1,319.99 = 418.21/x
  3. Step 3: Cross multiply
    880.20x = 1,319.99 × 418.21
  4. Step 4: Simplify right side
    880.20x = 552,027.63
  5. Step 5: Solve for x
    x = 552,027.63/880.20
  6. Step 6: Final answer
    x = 627.16

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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.