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Finding the Fourth Proportional to 1,739.46, 2,609.82 and 815.31

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Solution

The fourth proportional to 1,739.46, 2,609.82 and 815.31 is: 1,223.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,739.46 : 2,609.82 = 815.31 : x
  2. Step 2: Convert to fraction form
    1,739.46/2,609.82 = 815.31/x
  3. Step 3: Cross multiply
    1,739.46x = 2,609.82 × 815.31
  4. Step 4: Simplify right side
    1,739.46x = 2,127,812.34
  5. Step 5: Solve for x
    x = 2,127,812.34/1,739.46
  6. Step 6: Final answer
    x = 1,223.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.