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Finding the Fourth Proportional to 811.19, 1,119.38 and 457.07

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Solution

The fourth proportional to 811.19, 1,119.38 and 457.07 is: 630.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.19 : 1,119.38 = 457.07 : x
  2. Step 2: Convert to fraction form
    811.19/1,119.38 = 457.07/x
  3. Step 3: Cross multiply
    811.19x = 1,119.38 × 457.07
  4. Step 4: Simplify right side
    811.19x = 511,627.13
  5. Step 5: Solve for x
    x = 511,627.13/811.19
  6. Step 6: Final answer
    x = 630.71

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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.