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Finding the Fourth Proportional to 1,642.80, 2,465.22 and 668.76

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Solution

The fourth proportional to 1,642.80, 2,465.22 and 668.76 is: 1,003.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,642.80 : 2,465.22 = 668.76 : x
  2. Step 2: Convert to fraction form
    1,642.80/2,465.22 = 668.76/x
  3. Step 3: Cross multiply
    1,642.80x = 2,465.22 × 668.76
  4. Step 4: Simplify right side
    1,642.80x = 1,648,640.53
  5. Step 5: Solve for x
    x = 1,648,640.53/1,642.80
  6. Step 6: Final answer
    x = 1,003.56

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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.