Home / 1,438.59-2,157.75-669.09

Finding the Fourth Proportional to 1,438.59, 2,157.75 and 669.09

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Solution

The fourth proportional to 1,438.59, 2,157.75 and 669.09 is: 1,003.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.59 : 2,157.75 = 669.09 : x
  2. Step 2: Convert to fraction form
    1,438.59/2,157.75 = 669.09/x
  3. Step 3: Cross multiply
    1,438.59x = 2,157.75 × 669.09
  4. Step 4: Simplify right side
    1,438.59x = 1,443,728.95
  5. Step 5: Solve for x
    x = 1,443,728.95/1,438.59
  6. Step 6: Final answer
    x = 1,003.57

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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.