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Finding the Fourth Proportional to 812.41, 1,121.06 and 458.21

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Solution

The fourth proportional to 812.41, 1,121.06 and 458.21 is: 632.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.41 : 1,121.06 = 458.21 : x
  2. Step 2: Convert to fraction form
    812.41/1,121.06 = 458.21/x
  3. Step 3: Cross multiply
    812.41x = 1,121.06 × 458.21
  4. Step 4: Simplify right side
    812.41x = 513,684.85
  5. Step 5: Solve for x
    x = 513,684.85/812.41
  6. Step 6: Final answer
    x = 632.30

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1.5x scale

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.