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Finding the Fourth Proportional to 1,686.44, 2,529.04 and 645.91

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Solution

The fourth proportional to 1,686.44, 2,529.04 and 645.91 is: 968.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.44 : 2,529.04 = 645.91 : x
  2. Step 2: Convert to fraction form
    1,686.44/2,529.04 = 645.91/x
  3. Step 3: Cross multiply
    1,686.44x = 2,529.04 × 645.91
  4. Step 4: Simplify right side
    1,686.44x = 1,633,525.50
  5. Step 5: Solve for x
    x = 1,633,525.50/1,686.44
  6. Step 6: Final answer
    x = 968.63

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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.