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Finding the Fourth Proportional to 1,987.20, 2,980.67 and 526.37

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Solution

The fourth proportional to 1,987.20, 2,980.67 and 526.37 is: 789.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.20 : 2,980.67 = 526.37 : x
  2. Step 2: Convert to fraction form
    1,987.20/2,980.67 = 526.37/x
  3. Step 3: Cross multiply
    1,987.20x = 2,980.67 × 526.37
  4. Step 4: Simplify right side
    1,987.20x = 1,568,917.73
  5. Step 5: Solve for x
    x = 1,568,917.73/1,987.20
  6. Step 6: Final answer
    x = 789.51

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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.