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Finding the Fourth Proportional to 3,659.88, 5,489.90 and 1,320.07

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Solution

The fourth proportional to 3,659.88, 5,489.90 and 1,320.07 is: 1,980.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,659.88 : 5,489.90 = 1,320.07 : x
  2. Step 2: Convert to fraction form
    3,659.88/5,489.90 = 1,320.07/x
  3. Step 3: Cross multiply
    3,659.88x = 5,489.90 × 1,320.07
  4. Step 4: Simplify right side
    3,659.88x = 7,247,045.69
  5. Step 5: Solve for x
    x = 7,247,045.69/3,659.88
  6. Step 6: Final answer
    x = 1,980.13

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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.