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Finding the Fourth Proportional to 1,438.29, 2,157.44 and 437.49

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Solution

The fourth proportional to 1,438.29, 2,157.44 and 437.49 is: 656.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.29 : 2,157.44 = 437.49 : x
  2. Step 2: Convert to fraction form
    1,438.29/2,157.44 = 437.49/x
  3. Step 3: Cross multiply
    1,438.29x = 2,157.44 × 437.49
  4. Step 4: Simplify right side
    1,438.29x = 943,856.24
  5. Step 5: Solve for x
    x = 943,856.24/1,438.29
  6. Step 6: Final answer
    x = 656.24

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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.