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Finding the Fourth Proportional to 811.35, 1,119.74 and 479.61

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Solution

The fourth proportional to 811.35, 1,119.74 and 479.61 is: 661.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.35 : 1,119.74 = 479.61 : x
  2. Step 2: Convert to fraction form
    811.35/1,119.74 = 479.61/x
  3. Step 3: Cross multiply
    811.35x = 1,119.74 × 479.61
  4. Step 4: Simplify right side
    811.35x = 537,036.10
  5. Step 5: Solve for x
    x = 537,036.10/811.35
  6. Step 6: Final answer
    x = 661.90

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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.