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Finding the Fourth Proportional to 869.80, 1,200.30 and 476.84

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Solution

The fourth proportional to 869.80, 1,200.30 and 476.84 is: 658.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.80 : 1,200.30 = 476.84 : x
  2. Step 2: Convert to fraction form
    869.80/1,200.30 = 476.84/x
  3. Step 3: Cross multiply
    869.80x = 1,200.30 × 476.84
  4. Step 4: Simplify right side
    869.80x = 572,351.05
  5. Step 5: Solve for x
    x = 572,351.05/869.80
  6. Step 6: Final answer
    x = 658.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.