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Finding the Fourth Proportional to 2,390.88, 3,585 and 1,091.64

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Solution

The fourth proportional to 2,390.88, 3,585 and 1,091.64 is: 1,636.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,390.88 : 3,585 = 1,091.64 : x
  2. Step 2: Convert to fraction form
    2,390.88/3,585 = 1,091.64/x
  3. Step 3: Cross multiply
    2,390.88x = 3,585 × 1,091.64
  4. Step 4: Simplify right side
    2,390.88x = 3,913,529.40
  5. Step 5: Solve for x
    x = 3,913,529.40/2,390.88
  6. Step 6: Final answer
    x = 1,636.86

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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.