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Finding the Fourth Proportional to 1,105.74, 1,658.30 and 325.80

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Solution

The fourth proportional to 1,105.74, 1,658.30 and 325.80 is: 488.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.74 : 1,658.30 = 325.80 : x
  2. Step 2: Convert to fraction form
    1,105.74/1,658.30 = 325.80/x
  3. Step 3: Cross multiply
    1,105.74x = 1,658.30 × 325.80
  4. Step 4: Simplify right side
    1,105.74x = 540,272.51
  5. Step 5: Solve for x
    x = 540,272.51/1,105.74
  6. Step 6: Final answer
    x = 488.61

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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.