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Finding the Fourth Proportional to 811, 1,118.40 and 531.16

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Solution

The fourth proportional to 811, 1,118.40 and 531.16 is: 732.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    811 : 1,118.40 = 531.16 : x
  2. Step 2: Convert to fraction form
    811/1,118.40 = 531.16/x
  3. Step 3: Cross multiply
    811x = 1,118.40 × 531.16
  4. Step 4: Simplify right side
    811x = 594,049.34
  5. Step 5: Solve for x
    x = 594,049.34/811
  6. Step 6: Final answer
    x = 732.49

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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.