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Finding the Fourth Proportional to 817.59, 1,225.55 and 427.39

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Solution

The fourth proportional to 817.59, 1,225.55 and 427.39 is: 640.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.59 : 1,225.55 = 427.39 : x
  2. Step 2: Convert to fraction form
    817.59/1,225.55 = 427.39/x
  3. Step 3: Cross multiply
    817.59x = 1,225.55 × 427.39
  4. Step 4: Simplify right side
    817.59x = 523,785.82
  5. Step 5: Solve for x
    x = 523,785.82/817.59
  6. Step 6: Final answer
    x = 640.64

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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.