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Finding the Fourth Proportional to 1,805.78, 2,709.39 and 651.62

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Solution

The fourth proportional to 1,805.78, 2,709.39 and 651.62 is: 977.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,805.78 : 2,709.39 = 651.62 : x
  2. Step 2: Convert to fraction form
    1,805.78/2,709.39 = 651.62/x
  3. Step 3: Cross multiply
    1,805.78x = 2,709.39 × 651.62
  4. Step 4: Simplify right side
    1,805.78x = 1,765,492.71
  5. Step 5: Solve for x
    x = 1,765,492.71/1,805.78
  6. Step 6: Final answer
    x = 977.69

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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.