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Finding the Fourth Proportional to 1,686.24, 2,528.88 and 660

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Solution

The fourth proportional to 1,686.24, 2,528.88 and 660 is: 989.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.24 : 2,528.88 = 660 : x
  2. Step 2: Convert to fraction form
    1,686.24/2,528.88 = 660/x
  3. Step 3: Cross multiply
    1,686.24x = 2,528.88 × 660
  4. Step 4: Simplify right side
    1,686.24x = 1,669,060.80
  5. Step 5: Solve for x
    x = 1,669,060.80/1,686.24
  6. Step 6: Final answer
    x = 989.81

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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.