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Finding the Fourth Proportional to 1,242.79, 1,714.94 and 683.26

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Solution

The fourth proportional to 1,242.79, 1,714.94 and 683.26 is: 942.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.79 : 1,714.94 = 683.26 : x
  2. Step 2: Convert to fraction form
    1,242.79/1,714.94 = 683.26/x
  3. Step 3: Cross multiply
    1,242.79x = 1,714.94 × 683.26
  4. Step 4: Simplify right side
    1,242.79x = 1,171,749.90
  5. Step 5: Solve for x
    x = 1,171,749.90/1,242.79
  6. Step 6: Final answer
    x = 942.84

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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.