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Finding the Fourth Proportional to 880.59, 1,321.90 and 515.64

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Solution

The fourth proportional to 880.59, 1,321.90 and 515.64 is: 774.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.59 : 1,321.90 = 515.64 : x
  2. Step 2: Convert to fraction form
    880.59/1,321.90 = 515.64/x
  3. Step 3: Cross multiply
    880.59x = 1,321.90 × 515.64
  4. Step 4: Simplify right side
    880.59x = 681,624.52
  5. Step 5: Solve for x
    x = 681,624.52/880.59
  6. Step 6: Final answer
    x = 774.05

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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.