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Finding the Fourth Proportional to 1,256.17, 1,884.26 and 680.17

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Solution

The fourth proportional to 1,256.17, 1,884.26 and 680.17 is: 1,020.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.17 : 1,884.26 = 680.17 : x
  2. Step 2: Convert to fraction form
    1,256.17/1,884.26 = 680.17/x
  3. Step 3: Cross multiply
    1,256.17x = 1,884.26 × 680.17
  4. Step 4: Simplify right side
    1,256.17x = 1,281,617.12
  5. Step 5: Solve for x
    x = 1,281,617.12/1,256.17
  6. Step 6: Final answer
    x = 1,020.26

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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.