Home / 1,686.21-2,529.66-712.31

Finding the Fourth Proportional to 1,686.21, 2,529.66 and 712.31

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Solution

The fourth proportional to 1,686.21, 2,529.66 and 712.31 is: 1,068.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.21 : 2,529.66 = 712.31 : x
  2. Step 2: Convert to fraction form
    1,686.21/2,529.66 = 712.31/x
  3. Step 3: Cross multiply
    1,686.21x = 2,529.66 × 712.31
  4. Step 4: Simplify right side
    1,686.21x = 1,801,898.55
  5. Step 5: Solve for x
    x = 1,801,898.55/1,686.21
  6. Step 6: Final answer
    x = 1,068.61

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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.