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Finding the Fourth Proportional to 871.98, 1,203.30 and 478.98

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Solution

The fourth proportional to 871.98, 1,203.30 and 478.98 is: 660.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.98 : 1,203.30 = 478.98 : x
  2. Step 2: Convert to fraction form
    871.98/1,203.30 = 478.98/x
  3. Step 3: Cross multiply
    871.98x = 1,203.30 × 478.98
  4. Step 4: Simplify right side
    871.98x = 576,356.63
  5. Step 5: Solve for x
    x = 576,356.63/871.98
  6. Step 6: Final answer
    x = 660.97

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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.