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Finding the Fourth Proportional to 823.46, 1,235.22 and 390.14

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Solution

The fourth proportional to 823.46, 1,235.22 and 390.14 is: 585.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.46 : 1,235.22 = 390.14 : x
  2. Step 2: Convert to fraction form
    823.46/1,235.22 = 390.14/x
  3. Step 3: Cross multiply
    823.46x = 1,235.22 × 390.14
  4. Step 4: Simplify right side
    823.46x = 481,908.73
  5. Step 5: Solve for x
    x = 481,908.73/823.46
  6. Step 6: Final answer
    x = 585.22

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Double scale
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1.5x scale

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.