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Finding the Fourth Proportional to 832.78, 1,242.10 and 818.20

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Solution

The fourth proportional to 832.78, 1,242.10 and 818.20 is: 1,220.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.78 : 1,242.10 = 818.20 : x
  2. Step 2: Convert to fraction form
    832.78/1,242.10 = 818.20/x
  3. Step 3: Cross multiply
    832.78x = 1,242.10 × 818.20
  4. Step 4: Simplify right side
    832.78x = 1,016,286.22
  5. Step 5: Solve for x
    x = 1,016,286.22/832.78
  6. Step 6: Final answer
    x = 1,220.35

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.