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Finding the Fourth Proportional to 813.24, 1,121.64 and 518.22

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Solution

The fourth proportional to 813.24, 1,121.64 and 518.22 is: 714.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.24 : 1,121.64 = 518.22 : x
  2. Step 2: Convert to fraction form
    813.24/1,121.64 = 518.22/x
  3. Step 3: Cross multiply
    813.24x = 1,121.64 × 518.22
  4. Step 4: Simplify right side
    813.24x = 581,256.28
  5. Step 5: Solve for x
    x = 581,256.28/813.24
  6. Step 6: Final answer
    x = 714.74

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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.