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Finding the Fourth Proportional to 812.42, 1,119.90 and 637.46

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Solution

The fourth proportional to 812.42, 1,119.90 and 637.46 is: 878.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.42 : 1,119.90 = 637.46 : x
  2. Step 2: Convert to fraction form
    812.42/1,119.90 = 637.46/x
  3. Step 3: Cross multiply
    812.42x = 1,119.90 × 637.46
  4. Step 4: Simplify right side
    812.42x = 713,891.45
  5. Step 5: Solve for x
    x = 713,891.45/812.42
  6. Step 6: Final answer
    x = 878.72

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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.