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Finding the Fourth Proportional to 1,407.72, 1,942.63 and 818.26

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Solution

The fourth proportional to 1,407.72, 1,942.63 and 818.26 is: 1,129.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.72 : 1,942.63 = 818.26 : x
  2. Step 2: Convert to fraction form
    1,407.72/1,942.63 = 818.26/x
  3. Step 3: Cross multiply
    1,407.72x = 1,942.63 × 818.26
  4. Step 4: Simplify right side
    1,407.72x = 1,589,576.42
  5. Step 5: Solve for x
    x = 1,589,576.42/1,407.72
  6. Step 6: Final answer
    x = 1,129.19

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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.