Home / 1,416.80-2,135.72-1,320.80

Finding the Fourth Proportional to 1,416.80, 2,135.72 and 1,320.80

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Solution

The fourth proportional to 1,416.80, 2,135.72 and 1,320.80 is: 1,991.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,416.80 : 2,135.72 = 1,320.80 : x
  2. Step 2: Convert to fraction form
    1,416.80/2,135.72 = 1,320.80/x
  3. Step 3: Cross multiply
    1,416.80x = 2,135.72 × 1,320.80
  4. Step 4: Simplify right side
    1,416.80x = 2,820,858.98
  5. Step 5: Solve for x
    x = 2,820,858.98/1,416.80
  6. Step 6: Final answer
    x = 1,991.01

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.