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Finding the Fourth Proportional to 1,438.17, 2,157.86 and 573.09

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Solution

The fourth proportional to 1,438.17, 2,157.86 and 573.09 is: 859.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.17 : 2,157.86 = 573.09 : x
  2. Step 2: Convert to fraction form
    1,438.17/2,157.86 = 573.09/x
  3. Step 3: Cross multiply
    1,438.17x = 2,157.86 × 573.09
  4. Step 4: Simplify right side
    1,438.17x = 1,236,647.99
  5. Step 5: Solve for x
    x = 1,236,647.99/1,438.17
  6. Step 6: Final answer
    x = 859.88

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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.