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Finding the Fourth Proportional to 813.42, 1,122.60 and 464.16

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Solution

The fourth proportional to 813.42, 1,122.60 and 464.16 is: 640.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.42 : 1,122.60 = 464.16 : x
  2. Step 2: Convert to fraction form
    813.42/1,122.60 = 464.16/x
  3. Step 3: Cross multiply
    813.42x = 1,122.60 × 464.16
  4. Step 4: Simplify right side
    813.42x = 521,066.02
  5. Step 5: Solve for x
    x = 521,066.02/813.42
  6. Step 6: Final answer
    x = 640.59

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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.