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Finding the Fourth Proportional to 811.40, 1,119.62 and 457.28

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Solution

The fourth proportional to 811.40, 1,119.62 and 457.28 is: 630.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.40 : 1,119.62 = 457.28 : x
  2. Step 2: Convert to fraction form
    811.40/1,119.62 = 457.28/x
  3. Step 3: Cross multiply
    811.40x = 1,119.62 × 457.28
  4. Step 4: Simplify right side
    811.40x = 511,974.24
  5. Step 5: Solve for x
    x = 511,974.24/811.40
  6. Step 6: Final answer
    x = 630.98

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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.