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Finding the Fourth Proportional to 1,028.96, 1,421.76 and 809.65

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Solution

The fourth proportional to 1,028.96, 1,421.76 and 809.65 is: 1,118.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.96 : 1,421.76 = 809.65 : x
  2. Step 2: Convert to fraction form
    1,028.96/1,421.76 = 809.65/x
  3. Step 3: Cross multiply
    1,028.96x = 1,421.76 × 809.65
  4. Step 4: Simplify right side
    1,028.96x = 1,151,127.98
  5. Step 5: Solve for x
    x = 1,151,127.98/1,028.96
  6. Step 6: Final answer
    x = 1,118.73

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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.