Home / 1,991.20-2,752.64-1,521.40

Finding the Fourth Proportional to 1,991.20, 2,752.64 and 1,521.40

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Solution

The fourth proportional to 1,991.20, 2,752.64 and 1,521.40 is: 2,103.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.20 : 2,752.64 = 1,521.40 : x
  2. Step 2: Convert to fraction form
    1,991.20/2,752.64 = 1,521.40/x
  3. Step 3: Cross multiply
    1,991.20x = 2,752.64 × 1,521.40
  4. Step 4: Simplify right side
    1,991.20x = 4,187,866.50
  5. Step 5: Solve for x
    x = 4,187,866.50/1,991.20
  6. Step 6: Final answer
    x = 2,103.19

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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.