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Finding the Fourth Proportional to 2,005, 2,767.20 and 1,307.86

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Solution

The fourth proportional to 2,005, 2,767.20 and 1,307.86 is: 1,805.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,005 : 2,767.20 = 1,307.86 : x
  2. Step 2: Convert to fraction form
    2,005/2,767.20 = 1,307.86/x
  3. Step 3: Cross multiply
    2,005x = 2,767.20 × 1,307.86
  4. Step 4: Simplify right side
    2,005x = 3,619,110.19
  5. Step 5: Solve for x
    x = 3,619,110.19/2,005
  6. Step 6: Final answer
    x = 1,805.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.