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Finding the Fourth Proportional to 813.51, 1,220.79 and 448.56

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Solution

The fourth proportional to 813.51, 1,220.79 and 448.56 is: 673.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.51 : 1,220.79 = 448.56 : x
  2. Step 2: Convert to fraction form
    813.51/1,220.79 = 448.56/x
  3. Step 3: Cross multiply
    813.51x = 1,220.79 × 448.56
  4. Step 4: Simplify right side
    813.51x = 547,597.56
  5. Step 5: Solve for x
    x = 547,597.56/813.51
  6. Step 6: Final answer
    x = 673.13

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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.