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Finding the Fourth Proportional to 1,921.10, 2,882.10 and 688.64

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Solution

The fourth proportional to 1,921.10, 2,882.10 and 688.64 is: 1,033.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.10 : 2,882.10 = 688.64 : x
  2. Step 2: Convert to fraction form
    1,921.10/2,882.10 = 688.64/x
  3. Step 3: Cross multiply
    1,921.10x = 2,882.10 × 688.64
  4. Step 4: Simplify right side
    1,921.10x = 1,984,729.34
  5. Step 5: Solve for x
    x = 1,984,729.34/1,921.10
  6. Step 6: Final answer
    x = 1,033.12

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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.