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Finding the Fourth Proportional to 811.16, 1,118.87 and 479.57

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Solution

The fourth proportional to 811.16, 1,118.87 and 479.57 is: 661.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.16 : 1,118.87 = 479.57 : x
  2. Step 2: Convert to fraction form
    811.16/1,118.87 = 479.57/x
  3. Step 3: Cross multiply
    811.16x = 1,118.87 × 479.57
  4. Step 4: Simplify right side
    811.16x = 536,576.49
  5. Step 5: Solve for x
    x = 536,576.49/811.16
  6. Step 6: Final answer
    x = 661.49

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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.