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Finding the Fourth Proportional to 812.25, 1,121.45 and 502.29

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Solution

The fourth proportional to 812.25, 1,121.45 and 502.29 is: 693.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.25 : 1,121.45 = 502.29 : x
  2. Step 2: Convert to fraction form
    812.25/1,121.45 = 502.29/x
  3. Step 3: Cross multiply
    812.25x = 1,121.45 × 502.29
  4. Step 4: Simplify right side
    812.25x = 563,290.61
  5. Step 5: Solve for x
    x = 563,290.61/812.25
  6. Step 6: Final answer
    x = 693.49

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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.