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Finding the Fourth Proportional to 2,076.17, 3,113.47 and 689.24

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Solution

The fourth proportional to 2,076.17, 3,113.47 and 689.24 is: 1,033.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,076.17 : 3,113.47 = 689.24 : x
  2. Step 2: Convert to fraction form
    2,076.17/3,113.47 = 689.24/x
  3. Step 3: Cross multiply
    2,076.17x = 3,113.47 × 689.24
  4. Step 4: Simplify right side
    2,076.17x = 2,145,924.62
  5. Step 5: Solve for x
    x = 2,145,924.62/2,076.17
  6. Step 6: Final answer
    x = 1,033.60

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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.