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Finding the Fourth Proportional to 811.46, 1,119.80 and 475.45

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Solution

The fourth proportional to 811.46, 1,119.80 and 475.45 is: 656.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.46 : 1,119.80 = 475.45 : x
  2. Step 2: Convert to fraction form
    811.46/1,119.80 = 475.45/x
  3. Step 3: Cross multiply
    811.46x = 1,119.80 × 475.45
  4. Step 4: Simplify right side
    811.46x = 532,407.30
  5. Step 5: Solve for x
    x = 532,407.30/811.46
  6. Step 6: Final answer
    x = 656.11

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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.