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Finding the Fourth Proportional to 811.23, 1,119.36 and 479.67

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Solution

The fourth proportional to 811.23, 1,119.36 and 479.67 is: 661.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.23 : 1,119.36 = 479.67 : x
  2. Step 2: Convert to fraction form
    811.23/1,119.36 = 479.67/x
  3. Step 3: Cross multiply
    811.23x = 1,119.36 × 479.67
  4. Step 4: Simplify right side
    811.23x = 536,923.41
  5. Step 5: Solve for x
    x = 536,923.41/811.23
  6. Step 6: Final answer
    x = 661.86

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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.