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Finding the Fourth Proportional to 813.87, 1,123.29 and 464.58

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Solution

The fourth proportional to 813.87, 1,123.29 and 464.58 is: 641.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.87 : 1,123.29 = 464.58 : x
  2. Step 2: Convert to fraction form
    813.87/1,123.29 = 464.58/x
  3. Step 3: Cross multiply
    813.87x = 1,123.29 × 464.58
  4. Step 4: Simplify right side
    813.87x = 521,858.07
  5. Step 5: Solve for x
    x = 521,858.07/813.87
  6. Step 6: Final answer
    x = 641.21

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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.