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Finding the Fourth Proportional to 1,103.13, 1,655.46 and 829.80

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Solution

The fourth proportional to 1,103.13, 1,655.46 and 829.80 is: 1,245.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,103.13 : 1,655.46 = 829.80 : x
  2. Step 2: Convert to fraction form
    1,103.13/1,655.46 = 829.80/x
  3. Step 3: Cross multiply
    1,103.13x = 1,655.46 × 829.80
  4. Step 4: Simplify right side
    1,103.13x = 1,373,700.71
  5. Step 5: Solve for x
    x = 1,373,700.71/1,103.13
  6. Step 6: Final answer
    x = 1,245.28

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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.