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Finding the Fourth Proportional to 478.30, 660.12 and 281.83

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Solution

The fourth proportional to 478.30, 660.12 and 281.83 is: 388.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.30 : 660.12 = 281.83 : x
  2. Step 2: Convert to fraction form
    478.30/660.12 = 281.83/x
  3. Step 3: Cross multiply
    478.30x = 660.12 × 281.83
  4. Step 4: Simplify right side
    478.30x = 186,040.21
  5. Step 5: Solve for x
    x = 186,040.21/478.30
  6. Step 6: Final answer
    x = 388.96

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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.