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Finding the Fourth Proportional to 1,425.42, 2,136.90 and 559.56

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Solution

The fourth proportional to 1,425.42, 2,136.90 and 559.56 is: 838.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.42 : 2,136.90 = 559.56 : x
  2. Step 2: Convert to fraction form
    1,425.42/2,136.90 = 559.56/x
  3. Step 3: Cross multiply
    1,425.42x = 2,136.90 × 559.56
  4. Step 4: Simplify right side
    1,425.42x = 1,195,723.76
  5. Step 5: Solve for x
    x = 1,195,723.76/1,425.42
  6. Step 6: Final answer
    x = 838.86

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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.