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Finding the Fourth Proportional to 1,685.92, 2,528.16 and 659.68

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Solution

The fourth proportional to 1,685.92, 2,528.16 and 659.68 is: 989.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.92 : 2,528.16 = 659.68 : x
  2. Step 2: Convert to fraction form
    1,685.92/2,528.16 = 659.68/x
  3. Step 3: Cross multiply
    1,685.92x = 2,528.16 × 659.68
  4. Step 4: Simplify right side
    1,685.92x = 1,667,776.59
  5. Step 5: Solve for x
    x = 1,667,776.59/1,685.92
  6. Step 6: Final answer
    x = 989.24

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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.