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Finding the Fourth Proportional to 873.81, 1,311.30 and 441

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Solution

The fourth proportional to 873.81, 1,311.30 and 441 is: 661.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.81 : 1,311.30 = 441 : x
  2. Step 2: Convert to fraction form
    873.81/1,311.30 = 441/x
  3. Step 3: Cross multiply
    873.81x = 1,311.30 × 441
  4. Step 4: Simplify right side
    873.81x = 578,283.30
  5. Step 5: Solve for x
    x = 578,283.30/873.81
  6. Step 6: Final answer
    x = 661.80

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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.