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Finding the Fourth Proportional to 1,246.80, 1,720.66 and 687.39

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Solution

The fourth proportional to 1,246.80, 1,720.66 and 687.39 is: 948.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.80 : 1,720.66 = 687.39 : x
  2. Step 2: Convert to fraction form
    1,246.80/1,720.66 = 687.39/x
  3. Step 3: Cross multiply
    1,246.80x = 1,720.66 × 687.39
  4. Step 4: Simplify right side
    1,246.80x = 1,182,764.05
  5. Step 5: Solve for x
    x = 1,182,764.05/1,246.80
  6. Step 6: Final answer
    x = 948.64

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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.