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Finding the Fourth Proportional to 830.52, 1,243.89 and 505.17

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Solution

The fourth proportional to 830.52, 1,243.89 and 505.17 is: 756.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.52 : 1,243.89 = 505.17 : x
  2. Step 2: Convert to fraction form
    830.52/1,243.89 = 505.17/x
  3. Step 3: Cross multiply
    830.52x = 1,243.89 × 505.17
  4. Step 4: Simplify right side
    830.52x = 628,375.91
  5. Step 5: Solve for x
    x = 628,375.91/830.52
  6. Step 6: Final answer
    x = 756.61

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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.