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Finding the Fourth Proportional to 810.91, 1,119.21 and 479.44

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Solution

The fourth proportional to 810.91, 1,119.21 and 479.44 is: 661.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.91 : 1,119.21 = 479.44 : x
  2. Step 2: Convert to fraction form
    810.91/1,119.21 = 479.44/x
  3. Step 3: Cross multiply
    810.91x = 1,119.21 × 479.44
  4. Step 4: Simplify right side
    810.91x = 536,594.04
  5. Step 5: Solve for x
    x = 536,594.04/810.91
  6. Step 6: Final answer
    x = 661.72

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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.