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Finding the Fourth Proportional to 811.33, 1,119.55 and 479.69

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Solution

The fourth proportional to 811.33, 1,119.55 and 479.69 is: 661.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.33 : 1,119.55 = 479.69 : x
  2. Step 2: Convert to fraction form
    811.33/1,119.55 = 479.69/x
  3. Step 3: Cross multiply
    811.33x = 1,119.55 × 479.69
  4. Step 4: Simplify right side
    811.33x = 537,035.24
  5. Step 5: Solve for x
    x = 537,035.24/811.33
  6. Step 6: Final answer
    x = 661.92

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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.