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Finding the Fourth Proportional to 813.51, 1,219.19 and 379.89

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Solution

The fourth proportional to 813.51, 1,219.19 and 379.89 is: 569.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.51 : 1,219.19 = 379.89 : x
  2. Step 2: Convert to fraction form
    813.51/1,219.19 = 379.89/x
  3. Step 3: Cross multiply
    813.51x = 1,219.19 × 379.89
  4. Step 4: Simplify right side
    813.51x = 463,156.19
  5. Step 5: Solve for x
    x = 463,156.19/813.51
  6. Step 6: Final answer
    x = 569.33

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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.