Home / 2,421.81-3,631.37-1,188.90

Finding the Fourth Proportional to 2,421.81, 3,631.37 and 1,188.90

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Solution

The fourth proportional to 2,421.81, 3,631.37 and 1,188.90 is: 1,782.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,421.81 : 3,631.37 = 1,188.90 : x
  2. Step 2: Convert to fraction form
    2,421.81/3,631.37 = 1,188.90/x
  3. Step 3: Cross multiply
    2,421.81x = 3,631.37 × 1,188.90
  4. Step 4: Simplify right side
    2,421.81x = 4,317,329.85
  5. Step 5: Solve for x
    x = 4,317,329.85/2,421.81
  6. Step 6: Final answer
    x = 1,782.69

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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.