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Finding the Fourth Proportional to 1,813.90, 2,720.85 and 659.74

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Solution

The fourth proportional to 1,813.90, 2,720.85 and 659.74 is: 989.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,813.90 : 2,720.85 = 659.74 : x
  2. Step 2: Convert to fraction form
    1,813.90/2,720.85 = 659.74/x
  3. Step 3: Cross multiply
    1,813.90x = 2,720.85 × 659.74
  4. Step 4: Simplify right side
    1,813.90x = 1,795,036.68
  5. Step 5: Solve for x
    x = 1,795,036.68/1,813.90
  6. Step 6: Final answer
    x = 989.60

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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.