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Finding the Fourth Proportional to 871.80, 1,203 and 478.84

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Solution

The fourth proportional to 871.80, 1,203 and 478.84 is: 660.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.80 : 1,203 = 478.84 : x
  2. Step 2: Convert to fraction form
    871.80/1,203 = 478.84/x
  3. Step 3: Cross multiply
    871.80x = 1,203 × 478.84
  4. Step 4: Simplify right side
    871.80x = 576,044.52
  5. Step 5: Solve for x
    x = 576,044.52/871.80
  6. Step 6: Final answer
    x = 660.75

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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.