Home / 1,987.28-2,740.90-1,322.98

Finding the Fourth Proportional to 1,987.28, 2,740.90 and 1,322.98

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Solution

The fourth proportional to 1,987.28, 2,740.90 and 1,322.98 is: 1,824.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.28 : 2,740.90 = 1,322.98 : x
  2. Step 2: Convert to fraction form
    1,987.28/2,740.90 = 1,322.98/x
  3. Step 3: Cross multiply
    1,987.28x = 2,740.90 × 1,322.98
  4. Step 4: Simplify right side
    1,987.28x = 3,626,155.88
  5. Step 5: Solve for x
    x = 3,626,155.88/1,987.28
  6. Step 6: Final answer
    x = 1,824.68

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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.