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Finding the Fourth Proportional to 1,425.28, 2,136.64 and 655.36

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Solution

The fourth proportional to 1,425.28, 2,136.64 and 655.36 is: 982.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.28 : 2,136.64 = 655.36 : x
  2. Step 2: Convert to fraction form
    1,425.28/2,136.64 = 655.36/x
  3. Step 3: Cross multiply
    1,425.28x = 2,136.64 × 655.36
  4. Step 4: Simplify right side
    1,425.28x = 1,400,268.39
  5. Step 5: Solve for x
    x = 1,400,268.39/1,425.28
  6. Step 6: Final answer
    x = 982.45

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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.