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Finding the Fourth Proportional to 1,659.84, 2,489.76 and 919.91

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Solution

The fourth proportional to 1,659.84, 2,489.76 and 919.91 is: 1,379.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.84 : 2,489.76 = 919.91 : x
  2. Step 2: Convert to fraction form
    1,659.84/2,489.76 = 919.91/x
  3. Step 3: Cross multiply
    1,659.84x = 2,489.76 × 919.91
  4. Step 4: Simplify right side
    1,659.84x = 2,290,349.93
  5. Step 5: Solve for x
    x = 2,290,349.93/1,659.84
  6. Step 6: Final answer
    x = 1,379.86

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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.