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Finding the Fourth Proportional to 1,281.76, 1,922.01 and 665.30

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Solution

The fourth proportional to 1,281.76, 1,922.01 and 665.30 is: 997.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.76 : 1,922.01 = 665.30 : x
  2. Step 2: Convert to fraction form
    1,281.76/1,922.01 = 665.30/x
  3. Step 3: Cross multiply
    1,281.76x = 1,922.01 × 665.30
  4. Step 4: Simplify right side
    1,281.76x = 1,278,713.25
  5. Step 5: Solve for x
    x = 1,278,713.25/1,281.76
  6. Step 6: Final answer
    x = 997.62

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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.