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Finding the Fourth Proportional to 811.26, 1,119.64 and 457.20

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Solution

The fourth proportional to 811.26, 1,119.64 and 457.20 is: 630.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.26 : 1,119.64 = 457.20 : x
  2. Step 2: Convert to fraction form
    811.26/1,119.64 = 457.20/x
  3. Step 3: Cross multiply
    811.26x = 1,119.64 × 457.20
  4. Step 4: Simplify right side
    811.26x = 511,899.41
  5. Step 5: Solve for x
    x = 511,899.41/811.26
  6. Step 6: Final answer
    x = 630.99

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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.