Home / 1,987.14-2,739.72-1,420.64

Finding the Fourth Proportional to 1,987.14, 2,739.72 and 1,420.64

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Solution

The fourth proportional to 1,987.14, 2,739.72 and 1,420.64 is: 1,958.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.14 : 2,739.72 = 1,420.64 : x
  2. Step 2: Convert to fraction form
    1,987.14/2,739.72 = 1,420.64/x
  3. Step 3: Cross multiply
    1,987.14x = 2,739.72 × 1,420.64
  4. Step 4: Simplify right side
    1,987.14x = 3,892,155.82
  5. Step 5: Solve for x
    x = 3,892,155.82/1,987.14
  6. Step 6: Final answer
    x = 1,958.67

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1.5x scale

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.