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Finding the Fourth Proportional to 823.04, 1,234.84 and 390.14

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Solution

The fourth proportional to 823.04, 1,234.84 and 390.14 is: 585.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.04 : 1,234.84 = 390.14 : x
  2. Step 2: Convert to fraction form
    823.04/1,234.84 = 390.14/x
  3. Step 3: Cross multiply
    823.04x = 1,234.84 × 390.14
  4. Step 4: Simplify right side
    823.04x = 481,760.48
  5. Step 5: Solve for x
    x = 481,760.48/823.04
  6. Step 6: Final answer
    x = 585.34

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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.