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Finding the Fourth Proportional to 871.81, 1,203.11 and 478.83

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Solution

The fourth proportional to 871.81, 1,203.11 and 478.83 is: 660.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.81 : 1,203.11 = 478.83 : x
  2. Step 2: Convert to fraction form
    871.81/1,203.11 = 478.83/x
  3. Step 3: Cross multiply
    871.81x = 1,203.11 × 478.83
  4. Step 4: Simplify right side
    871.81x = 576,085.16
  5. Step 5: Solve for x
    x = 576,085.16/871.81
  6. Step 6: Final answer
    x = 660.80

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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.