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Finding the Fourth Proportional to 1,142.02, 1,711.21 and 655.41

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Solution

The fourth proportional to 1,142.02, 1,711.21 and 655.41 is: 982.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.02 : 1,711.21 = 655.41 : x
  2. Step 2: Convert to fraction form
    1,142.02/1,711.21 = 655.41/x
  3. Step 3: Cross multiply
    1,142.02x = 1,711.21 × 655.41
  4. Step 4: Simplify right side
    1,142.02x = 1,121,544.15
  5. Step 5: Solve for x
    x = 1,121,544.15/1,142.02
  6. Step 6: Final answer
    x = 982.07

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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.