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Finding the Fourth Proportional to 1,687.71, 2,531.91 and 713.81

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Solution

The fourth proportional to 1,687.71, 2,531.91 and 713.81 is: 1,070.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.71 : 2,531.91 = 713.81 : x
  2. Step 2: Convert to fraction form
    1,687.71/2,531.91 = 713.81/x
  3. Step 3: Cross multiply
    1,687.71x = 2,531.91 × 713.81
  4. Step 4: Simplify right side
    1,687.71x = 1,807,302.68
  5. Step 5: Solve for x
    x = 1,807,302.68/1,687.71
  6. Step 6: Final answer
    x = 1,070.86

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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.