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Finding the Fourth Proportional to 1,438.70, 2,158.14 and 573

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Solution

The fourth proportional to 1,438.70, 2,158.14 and 573 is: 859.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.70 : 2,158.14 = 573 : x
  2. Step 2: Convert to fraction form
    1,438.70/2,158.14 = 573/x
  3. Step 3: Cross multiply
    1,438.70x = 2,158.14 × 573
  4. Step 4: Simplify right side
    1,438.70x = 1,236,614.22
  5. Step 5: Solve for x
    x = 1,236,614.22/1,438.70
  6. Step 6: Final answer
    x = 859.54

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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.