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Finding the Fourth Proportional to 1,246.50, 1,720.26 and 687.07

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Solution

The fourth proportional to 1,246.50, 1,720.26 and 687.07 is: 948.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.50 : 1,720.26 = 687.07 : x
  2. Step 2: Convert to fraction form
    1,246.50/1,720.26 = 687.07/x
  3. Step 3: Cross multiply
    1,246.50x = 1,720.26 × 687.07
  4. Step 4: Simplify right side
    1,246.50x = 1,181,939.04
  5. Step 5: Solve for x
    x = 1,181,939.04/1,246.50
  6. Step 6: Final answer
    x = 948.21

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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.