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Finding the Fourth Proportional to 1,815.36, 2,717.12 and 991.58

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Solution

The fourth proportional to 1,815.36, 2,717.12 and 991.58 is: 1,484.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.36 : 2,717.12 = 991.58 : x
  2. Step 2: Convert to fraction form
    1,815.36/2,717.12 = 991.58/x
  3. Step 3: Cross multiply
    1,815.36x = 2,717.12 × 991.58
  4. Step 4: Simplify right side
    1,815.36x = 2,694,241.85
  5. Step 5: Solve for x
    x = 2,694,241.85/1,815.36
  6. Step 6: Final answer
    x = 1,484.14

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1.5x scale

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.