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Finding the Fourth Proportional to 1,242.65, 1,714.86 and 683.18

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Solution

The fourth proportional to 1,242.65, 1,714.86 and 683.18 is: 942.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.65 : 1,714.86 = 683.18 : x
  2. Step 2: Convert to fraction form
    1,242.65/1,714.86 = 683.18/x
  3. Step 3: Cross multiply
    1,242.65x = 1,714.86 × 683.18
  4. Step 4: Simplify right side
    1,242.65x = 1,171,548.63
  5. Step 5: Solve for x
    x = 1,171,548.63/1,242.65
  6. Step 6: Final answer
    x = 942.78

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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.