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Finding the Fourth Proportional to 812.95, 1,121.87 and 463.63

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Solution

The fourth proportional to 812.95, 1,121.87 and 463.63 is: 639.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.95 : 1,121.87 = 463.63 : x
  2. Step 2: Convert to fraction form
    812.95/1,121.87 = 463.63/x
  3. Step 3: Cross multiply
    812.95x = 1,121.87 × 463.63
  4. Step 4: Simplify right side
    812.95x = 520,124.66
  5. Step 5: Solve for x
    x = 520,124.66/812.95
  6. Step 6: Final answer
    x = 639.80

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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.