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Finding the Fourth Proportional to 813.56, 1,122.65 and 464.25

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Solution

The fourth proportional to 813.56, 1,122.65 and 464.25 is: 640.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.56 : 1,122.65 = 464.25 : x
  2. Step 2: Convert to fraction form
    813.56/1,122.65 = 464.25/x
  3. Step 3: Cross multiply
    813.56x = 1,122.65 × 464.25
  4. Step 4: Simplify right side
    813.56x = 521,190.26
  5. Step 5: Solve for x
    x = 521,190.26/813.56
  6. Step 6: Final answer
    x = 640.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.