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Finding the Fourth Proportional to 1,425.37, 2,136.42 and 654.25

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Solution

The fourth proportional to 1,425.37, 2,136.42 and 654.25 is: 980.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.37 : 2,136.42 = 654.25 : x
  2. Step 2: Convert to fraction form
    1,425.37/2,136.42 = 654.25/x
  3. Step 3: Cross multiply
    1,425.37x = 2,136.42 × 654.25
  4. Step 4: Simplify right side
    1,425.37x = 1,397,752.79
  5. Step 5: Solve for x
    x = 1,397,752.79/1,425.37
  6. Step 6: Final answer
    x = 980.62

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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.