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Finding the Fourth Proportional to 811.02, 1,118.57 and 479.44

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Solution

The fourth proportional to 811.02, 1,118.57 and 479.44 is: 661.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.02 : 1,118.57 = 479.44 : x
  2. Step 2: Convert to fraction form
    811.02/1,118.57 = 479.44/x
  3. Step 3: Cross multiply
    811.02x = 1,118.57 × 479.44
  4. Step 4: Simplify right side
    811.02x = 536,287.20
  5. Step 5: Solve for x
    x = 536,287.20/811.02
  6. Step 6: Final answer
    x = 661.25

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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.