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Finding the Fourth Proportional to 811.04, 1,119.13 and 479.43

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Solution

The fourth proportional to 811.04, 1,119.13 and 479.43 is: 661.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.04 : 1,119.13 = 479.43 : x
  2. Step 2: Convert to fraction form
    811.04/1,119.13 = 479.43/x
  3. Step 3: Cross multiply
    811.04x = 1,119.13 × 479.43
  4. Step 4: Simplify right side
    811.04x = 536,543.30
  5. Step 5: Solve for x
    x = 536,543.30/811.04
  6. Step 6: Final answer
    x = 661.55

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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.