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Finding the Fourth Proportional to 821.81, 1,231.67 and 383.06

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Solution

The fourth proportional to 821.81, 1,231.67 and 383.06 is: 574.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.81 : 1,231.67 = 383.06 : x
  2. Step 2: Convert to fraction form
    821.81/1,231.67 = 383.06/x
  3. Step 3: Cross multiply
    821.81x = 1,231.67 × 383.06
  4. Step 4: Simplify right side
    821.81x = 471,807.55
  5. Step 5: Solve for x
    x = 471,807.55/821.81
  6. Step 6: Final answer
    x = 574.11

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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.