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Finding the Fourth Proportional to 1,919.09, 2,878.75 and 686.63

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Solution

The fourth proportional to 1,919.09, 2,878.75 and 686.63 is: 1,029.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.09 : 2,878.75 = 686.63 : x
  2. Step 2: Convert to fraction form
    1,919.09/2,878.75 = 686.63/x
  3. Step 3: Cross multiply
    1,919.09x = 2,878.75 × 686.63
  4. Step 4: Simplify right side
    1,919.09x = 1,976,636.11
  5. Step 5: Solve for x
    x = 1,976,636.11/1,919.09
  6. Step 6: Final answer
    x = 1,029.99

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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.